diff --git a/VERSION b/VERSION
index f3b15f3..1defe53 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-v2.0.2
+v2.1.0
diff --git a/config.go b/config.go
index 95da5a3..5fa7008 100644
--- a/config.go
+++ b/config.go
@@ -135,6 +135,9 @@ type Config struct {
 	// should be used for the given package names, it can be used when the
 	// correct import path is not found automatically.
 	ImportPathOverrides map[string]string `yaml:"import_path_overrides,omitempty"`
+	// CustomTypes fields marks fields as custom types like the
+	// "gogoproto.customtype" tag would do.
+	CustomTypes map[string]string `yaml:"custom_types,omitempty"`
 
 	// params represents CLI params passed from the plugin
 	params map[string]string `yaml:"-"`
diff --git a/field_build_context.go b/field_build_context.go
index 756431d..4b70f6f 100644
--- a/field_build_context.go
+++ b/field_build_context.go
@@ -307,12 +307,17 @@ func (c *FieldBuildContext) IsMessage() bool {
 }
 
 // IsCustomType returns true if fields has gogo.custom_type flag
+// or if there's a custom type override in configuration.
 func (c *FieldBuildContext) IsCustomType() bool {
-	return c.field.IsCustomType()
+	_, ok := c.config.CustomTypes[c.GetPath()]
+	return c.field.IsCustomType() || ok
 }
 
 // GetCustomType returns true if fields has gogo.custom_type flag
 func (c *FieldBuildContext) GetCustomType() string {
+	if customType, ok := c.config.CustomTypes[c.GetPath()]; ok {
+		return customType
+	}
 	return c.field.GetCustomType()
 }
 
diff --git a/test/config.yaml b/test/config.yaml
index 8abe592..7ed39a7 100644
--- a/test/config.yaml
+++ b/test/config.yaml
@@ -48,3 +48,6 @@ plan_modifiers:
 validators:
   "Test.Str":
     - UseMockValidator()
+
+custom_types:
+  "Test.StringOverride": StringCustom
diff --git a/test/copy_from_terraform_test.go b/test/copy_from_terraform_test.go
index 3725e7a..42a157e 100644
--- a/test/copy_from_terraform_test.go
+++ b/test/copy_from_terraform_test.go
@@ -195,3 +195,12 @@ func TestCopyFromNullableEmbeddedFieldWithoutValue(t *testing.T) {
 	// should be nil
 	require.Nil(t, target.MaxAgeDuration)
 }
+
+func TestCopyFromStringOverride(t *testing.T) {
+	obj := copyFromTerraformObject(t)
+
+	target := Test{}
+	require.False(t, CopyTestFromTerraform(context.Background(), obj, &target).HasError())
+
+	require.Equal(t, "a/b/c", target.StringOverride)
+}
diff --git a/test/custom_types.go b/test/custom_types.go
index e7a1946..8c14945 100644
--- a/test/custom_types.go
+++ b/test/custom_types.go
@@ -3,6 +3,7 @@ package test
 import (
 	"context"
 	fmt "fmt"
+	"strings"
 	time "time"
 
 	"github.com/hashicorp/terraform-plugin-framework/attr"
@@ -78,3 +79,65 @@ func CopyToBoolSpecial(diags diag.Diagnostics, obj []BoolCustom, t attr.Type, v
 
 	return value
 }
+
+// StringCustom is a custom type that maps a Terraform List of string, onto a
+// single go string by joining all elements with "/".
+
+// GenSchemaStringCustom returns the StringCustom schema.
+func GenSchemaStringCustom(_ context.Context) tfsdk.Attribute {
+	return tfsdk.Attribute{
+		Type: types.ListType{
+			ElemType: types.StringType,
+		},
+	}
+}
+
+// CopyFromStringCustom copies the value from Terraform (a list of strings) into
+// the source (a single string) by joining all elements with "/".
+func CopyFromStringCustom(diags diag.Diagnostics, tf attr.Value, obj *string) {
+	v, ok := tf.(types.List)
+	if !ok {
+		diags.AddError("Error reading value from Terraform", fmt.Sprintf("Failed to cast %T to types.List", tf))
+		return
+	}
+
+	items := make([]string, 0)
+	for _, raw := range v.Elems {
+		el, ok := raw.(types.String)
+		if !ok {
+			diags.AddError("Error reading value from Terraform", fmt.Sprintf("Failed to cast %T to types.Bool", raw))
+			return
+		}
+
+		if !el.Null && !el.Unknown {
+			items = append(items, el.Value)
+		}
+	}
+
+	*obj = strings.Join(items, "/")
+}
+
+// CopyToStringCustom copies a source value (single string) into the Terraform
+// value (a list of strings) by splitting the string on every "/".
+func CopyToStringCustom(diags diag.Diagnostics, obj string, t attr.Type, v attr.Value) attr.Value {
+	value, ok := v.(types.List)
+	if !ok {
+		value = types.List{
+			Null:     true,
+			Unknown:  false,
+			ElemType: types.StringType,
+		}
+	}
+
+	if len(obj) > 0 {
+		if value.Elems == nil {
+			value.Elems = make([]attr.Value, len(obj))
+		}
+
+		for i, b := range strings.Split(obj, "/") {
+			value.Elems[i] = types.String{Null: false, Unknown: false, Value: b}
+		}
+	}
+
+	return value
+}
diff --git a/test/fixtures.go b/test/fixtures.go
index 0493593..f431969 100644
--- a/test/fixtures.go
+++ b/test/fixtures.go
@@ -423,6 +423,11 @@ func copyFromTerraformObject(t *testing.T) types.Object {
 				},
 			},
 			"max_age": DurationValue{Value: duration},
+			"string_override": types.List{Elems: []attr.Value{
+				types.String{Value: "a"},
+				types.String{Value: "b"},
+				types.String{Value: "c"},
+			}},
 		},
 		AttrTypes: obj.AttrTypes,
 	}
diff --git a/test/test.pb.go b/test/test.pb.go
index 295a0d1..ee4bf2c 100644
--- a/test/test.pb.go
+++ b/test/test.pb.go
@@ -128,8 +128,11 @@ type Test struct {
 	//	*Test_StringBranch
 	OneOfWithEmptyMessage isTest_OneOfWithEmptyMessage `protobuf_oneof:"OneOfWithEmptyMessage"`
 	// EmbeddedField encapsulates fields which can be shared among various types
-	EmbeddedField        `protobuf:"bytes,38,opt,name=EmbeddedField,proto3,embedded=EmbeddedField" json:""`
-	*MaxAgeDuration      `protobuf:"bytes,39,opt,name=EmbedNullable,proto3,embedded=EmbedNullable" json:""`
+	EmbeddedField   `protobuf:"bytes,38,opt,name=EmbeddedField,proto3,embedded=EmbeddedField" json:""`
+	*MaxAgeDuration `protobuf:"bytes,39,opt,name=EmbedNullable,proto3,embedded=EmbedNullable" json:""`
+	// BoolCustomOverride []bool field, gogoproto.customtype is not set but there
+	// is custom_type override in the configuration
+	StringOverride       string   `protobuf:"bytes,40,opt,name=StringOverride,proto3" json:"StringOverride,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -535,77 +538,78 @@ func init() {
 func init() { proto.RegisterFile("test.proto", fileDescriptor_c161fcfdc0c3ff1e) }
 
 var fileDescriptor_c161fcfdc0c3ff1e = []byte{
-	// 1141 bytes of a gzipped FileDescriptorProto
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+	// 1158 bytes of a gzipped FileDescriptorProto
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-	0xc8, 0x1d, 0x9e, 0x9f, 0x0e, 0xa6, 0x5d, 0xde, 0xa5, 0x9a, 0x68, 0xd3, 0x7e, 0x8c, 0x1f, 0x42,
-	0xd6, 0x98, 0x98, 0xa3, 0xd3, 0xb3, 0x5d, 0x7a, 0x5b, 0x9c, 0xd8, 0xaa, 0x94, 0xcf, 0xc1, 0x47,
-	0x29, 0xe6, 0xe5, 0x03, 0x6a, 0x83, 0xd6, 0x16, 0xa9, 0x8d, 0x80, 0xda, 0xc0, 0x8a, 0x47, 0xdd,
-	0xa3, 0xef, 0xbb, 0xbf, 0xa3, 0x20, 0xb7, 0x87, 0x8f, 0x01, 0x45, 0x0d, 0x36, 0xb9, 0x6d, 0x9b,
-	0x3d, 0x2e, 0x61, 0x7a, 0x47, 0x38, 0x52, 0xe9, 0xb8, 0x98, 0x7f, 0x44, 0x58, 0x82, 0x0a, 0xef,
-	0x40, 0x41, 0x56, 0xf6, 0xdc, 0xe5, 0xae, 0xf8, 0x18, 0x61, 0x11, 0x14, 0xbf, 0x81, 0xd5, 0xc3,
-	0x61, 0x87, 0x77, 0xbb, 0xbc, 0x7b, 0xd4, 0xe7, 0x83, 0x2e, 0xfd, 0x40, 0x7c, 0x6c, 0xc3, 0xfb,
-	0x58, 0x28, 0x65, 0x14, 0xdc, 0x33, 0x7b, 0x35, 0x53, 0xc9, 0x95, 0x7b, 0x76, 0x51, 0x1d, 0x1e,
-	0xcc, 0x8d, 0xfc, 0xb3, 0xbb, 0x27, 0x8c, 0xca, 0xf3, 0x1d, 0x37, 0xcf, 0xbf, 0xea, 0x71, 0xaf,
-	0x20, 0x8d, 0x5c, 0xcc, 0xc5, 0x13, 0x55, 0xf6, 0x21, 0xe7, 0xdd, 0x2a, 0x2c, 0x81, 0xf2, 0x13,
-	0xbf, 0x90, 0xff, 0x6c, 0xe6, 0x0e, 0xdd, 0x7f, 0xe7, 0xcf, 0xa2, 0x80, 0xd2, 0x02, 0x93, 0xc1,
-	0xc3, 0xf4, 0x27, 0xa4, 0xf2, 0x18, 0x8a, 0xd1, 0x0b, 0x96, 0xa0, 0xae, 0x85, 0xd5, 0xb1, 0xeb,
-	0x1f, 0xf6, 0x62, 0xb0, 0x95, 0x7c, 0xcb, 0xde, 0xdd, 0xd3, 0xc8, 0xc2, 0x52, 0x7b, 0xc4, 0xdb,
-	0x2f, 0x8c, 0x6d, 0xd8, 0x14, 0x03, 0xb7, 0xb2, 0xc3, 0x87, 0x56, 0xfb, 0xd2, 0x5d, 0x41, 0x78,
-	0x93, 0xf0, 0x23, 0x58, 0x92, 0xed, 0x82, 0x88, 0xbf, 0xc0, 0xf6, 0xd5, 0x4c, 0xcd, 0x0e, 0xcd,
-	0xf3, 0xe7, 0x66, 0x8f, 0x47, 0xfa, 0x9c, 0x64, 0xd5, 0xca, 0x49, 0x77, 0xa7, 0xf6, 0x47, 0xda,
-	0xeb, 0x78, 0xee, 0xec, 0xfd, 0x37, 0x90, 0x7c, 0xf9, 0xec, 0x46, 0x3a, 0x4a, 0x5a, 0x14, 0xdb,
-	0xba, 0x5c, 0x42, 0xdb, 0x39, 0xe3, 0x93, 0xf9, 0x3a, 0xc2, 0x0d, 0xe5, 0x9e, 0x6c, 0x06, 0x8a,
-	0xe0, 0x6e, 0x86, 0x97, 0x1b, 0x6b, 0x07, 0x3f, 0xc0, 0x5a, 0xb0, 0x8b, 0xb2, 0xe5, 0x66, 0xc2,
-	0xd5, 0x1c, 0x88, 0xc2, 0x9c, 0x70, 0x73, 0x88, 0xeb, 0xdf, 0xf9, 0x72, 0x9c, 0x40, 0x39, 0xe9,
-	0x33, 0x09, 0x1e, 0xf7, 0xa2, 0xc7, 0x99, 0xb0, 0x17, 0x81, 0x6d, 0x4d, 0x85, 0x95, 0x50, 0x66,
-	0x71, 0x7b, 0x6b, 0x37, 0xfd, 0xfe, 0x91, 0x90, 0x54, 0xfd, 0x8e, 0x11, 0x3c, 0x40, 0x49, 0xe8,
-	0x01, 0x5a, 0xfb, 0x8d, 0xc4, 0x4a, 0x13, 0x3f, 0x85, 0xa2, 0x07, 0xc8, 0x1a, 0x9e, 0xbf, 0x67,
-	0x37, 0xae, 0x66, 0xea, 0x1a, 0x9f, 0x67, 0x9e, 0xdb, 0x22, 0xc5, 0x62, 0x54, 0x7c, 0x02, 0x1b,
-	0x1e, 0x22, 0x27, 0x2c, 0xcb, 0x5d, 0x2e, 0xf4, 0x46, 0xb4, 0xdc, 0x43, 0x04, 0x96, 0xa4, 0xaa,
-	0xf1, 0x44, 0x33, 0x6c, 0x41, 0x39, 0x0a, 0x47, 0xa6, 0x59, 0xb9, 0x9a, 0xa9, 0x5b, 0xfe, 0x34,
-	0x47, 0x82, 0xe0, 0xcd, 0x36, 0x51, 0x77, 0xff, 0x8e, 0x6c, 0xde, 0xb8, 0x02, 0xd9, 0x93, 0xd6,
-	0x93, 0x56, 0xfb, 0x59, 0xab, 0x94, 0xc2, 0x65, 0x48, 0xb7, 0x5b, 0x25, 0x82, 0x59, 0x50, 0xda,
-	0x47, 0x47, 0xa5, 0xb4, 0x51, 0xb8, 0xfc, 0xbb, 0x9a, 0xba, 0x7c, 0x5d, 0x4d, 0xbd, 0x7a, 0x5d,
-	0x4d, 0x75, 0x96, 0xc5, 0x43, 0x62, 0xef, 0xdf, 0x00, 0x00, 0x00, 0xff, 0xff, 0x4e, 0xfe, 0x42,
-	0x84, 0x44, 0x0c, 0x00, 0x00,
+	0xc8, 0x1d, 0x9c, 0x9d, 0x0c, 0xa6, 0x5d, 0xde, 0xa5, 0x9a, 0x68, 0xd3, 0x7e, 0x8c, 0x1f, 0x41,
+	0xd6, 0x98, 0x98, 0xa3, 0x93, 0xd3, 0x1d, 0x7a, 0x5b, 0x54, 0x6c, 0x55, 0xca, 0xe7, 0xe0, 0x93,
+	0x14, 0xf3, 0xf2, 0x01, 0xb5, 0x41, 0x6b, 0x8b, 0xd4, 0x46, 0x40, 0x6d, 0x60, 0xc5, 0xa3, 0xee,
+	0xd2, 0xff, 0xbb, 0xbf, 0xa3, 0x20, 0xb7, 0x8b, 0x4f, 0x01, 0xc5, 0x1d, 0x6c, 0x72, 0xdb, 0x36,
+	0x7b, 0x5c, 0xc2, 0xf4, 0x8e, 0x70, 0xa4, 0xd2, 0x71, 0x31, 0xff, 0x84, 0xb0, 0x04, 0x15, 0xde,
+	0x81, 0x82, 0xbc, 0xd9, 0x73, 0x97, 0xbb, 0xe2, 0x63, 0x84, 0x45, 0x50, 0xfc, 0x16, 0x56, 0x0f,
+	0x86, 0x1d, 0xde, 0xed, 0xf2, 0xee, 0x61, 0x9f, 0x0f, 0xba, 0xf4, 0x9e, 0xf8, 0xd8, 0x86, 0xf7,
+	0xb1, 0x50, 0xca, 0x28, 0xb8, 0x35, 0xbb, 0x9c, 0xa9, 0xe4, 0xca, 0xad, 0x5d, 0x54, 0x87, 0xfb,
+	0x73, 0x23, 0xbf, 0x76, 0xf7, 0x85, 0x51, 0x79, 0xbe, 0xe3, 0xe6, 0xd9, 0xd7, 0x3d, 0xee, 0x5d,
+	0x48, 0x23, 0x17, 0x73, 0xf1, 0xcb, 0x75, 0x0f, 0x8a, 0x72, 0x7a, 0xed, 0x37, 0x7c, 0x32, 0xe9,
+	0x77, 0x39, 0xd5, 0xdd, 0x69, 0xb3, 0x18, 0x5a, 0xd9, 0x83, 0x9c, 0x77, 0xfa, 0xb0, 0x04, 0xca,
+	0xcf, 0xfc, 0x5c, 0xfe, 0xdb, 0x99, 0x3b, 0x74, 0xff, 0xb1, 0x6f, 0xc4, 0x45, 0x4b, 0x0b, 0x4c,
+	0x06, 0x8f, 0xd3, 0x9f, 0x92, 0xca, 0x53, 0x28, 0x46, 0x0f, 0x62, 0x82, 0xba, 0x16, 0x56, 0xc7,
+	0xae, 0x49, 0xd8, 0x8b, 0xc1, 0x56, 0xf2, 0x69, 0xfc, 0x70, 0x4f, 0x23, 0x0b, 0x4b, 0xed, 0x11,
+	0x6f, 0xbf, 0x32, 0xb6, 0x61, 0x53, 0x0c, 0xdc, 0x0e, 0x10, 0x2e, 0x6e, 0xed, 0x2b, 0x77, 0x05,
+	0xe1, 0xcd, 0xc4, 0x8f, 0x61, 0x49, 0xb6, 0x15, 0x22, 0xfe, 0x16, 0xdb, 0x57, 0x33, 0x35, 0x3b,
+	0x34, 0xcf, 0x5e, 0x9a, 0x3d, 0x1e, 0xe9, 0x87, 0x92, 0x55, 0x2b, 0x27, 0x9d, 0xb1, 0xda, 0xef,
+	0x69, 0xaf, 0x33, 0xba, 0xb3, 0xf7, 0xdf, 0x4a, 0xf2, 0x85, 0xb4, 0x13, 0xe9, 0x3c, 0x69, 0x71,
+	0x29, 0xd7, 0xe5, 0x12, 0xda, 0xce, 0x29, 0x9f, 0xcc, 0xd7, 0x11, 0x6e, 0x3c, 0xf7, 0x65, 0xd3,
+	0x50, 0x04, 0x77, 0x33, 0xbc, 0xdc, 0x58, 0xdb, 0xf8, 0x11, 0xd6, 0x82, 0x5d, 0x94, 0xad, 0x39,
+	0x13, 0xbe, 0xf5, 0x81, 0x28, 0xcc, 0x09, 0x37, 0x91, 0xb8, 0xfe, 0x83, 0x0f, 0xc7, 0x31, 0x94,
+	0x93, 0x3e, 0x93, 0xe0, 0x71, 0x3f, 0x5a, 0xce, 0x84, 0xbd, 0x08, 0x6c, 0x6b, 0x2a, 0xac, 0x84,
+	0x32, 0x8b, 0xdb, 0x5b, 0xbb, 0xe9, 0xf7, 0x99, 0x84, 0xa4, 0xea, 0x77, 0x96, 0xe0, 0xa1, 0x4a,
+	0x42, 0x0f, 0xd5, 0xda, 0x6f, 0x24, 0x76, 0x85, 0xf1, 0x33, 0x28, 0x7a, 0x80, 0xbc, 0x36, 0xf3,
+	0x77, 0xef, 0xc6, 0xd5, 0x4c, 0x5d, 0xe3, 0xf3, 0xcc, 0x4b, 0x5b, 0xa4, 0x58, 0x8c, 0x8a, 0xcf,
+	0x60, 0xc3, 0x43, 0xe4, 0x84, 0x65, 0x5b, 0x90, 0x0b, 0xbd, 0x11, 0x6d, 0x0b, 0x21, 0x02, 0x4b,
+	0x52, 0xd5, 0x78, 0xa2, 0x19, 0xb6, 0xa0, 0x1c, 0x85, 0x23, 0xd3, 0xac, 0x5c, 0xcd, 0xd4, 0x2d,
+	0x7f, 0x9a, 0x23, 0x41, 0xf0, 0x66, 0x9b, 0xa8, 0x7b, 0x70, 0x47, 0x36, 0x79, 0x5c, 0x81, 0xec,
+	0x71, 0xeb, 0x59, 0xab, 0xfd, 0xa2, 0x55, 0x4a, 0xe1, 0x32, 0xa4, 0xdb, 0xad, 0x12, 0xc1, 0x2c,
+	0x28, 0xed, 0xc3, 0xc3, 0x52, 0xda, 0x28, 0x5c, 0xfc, 0x55, 0x4d, 0x5d, 0xbc, 0xad, 0xa6, 0x2e,
+	0xdf, 0x56, 0x53, 0x9d, 0x65, 0xf1, 0xe0, 0xd8, 0xfd, 0x27, 0x00, 0x00, 0xff, 0xff, 0xd5, 0xb0,
+	0x20, 0xb8, 0x6c, 0x0c, 0x00, 0x00,
 }
diff --git a/test/test.proto b/test/test.proto
index 01fd0fc..ca89301 100644
--- a/test/test.proto
+++ b/test/test.proto
@@ -166,6 +166,13 @@ message Test {
         (gogoproto.jsontag) = "",
         (gogoproto.embed) = true
       ];
+
+    // StringOverride is represented by a single string in the go struct, but by
+    // a list of strings in the Terraform Schema. The plugin's configuration
+    // specifies a custom_type (StringCustom), the generator should use the
+    // functions "GenSchemaStringCustom", "CopyFromStringCustom",
+    // "CopyToStringCustom" instead of attempting to generate them.
+    string StringOverride = 40;
 }
 
 message MaxAgeDuration {
@@ -223,4 +230,3 @@ message EmbeddedNestedField {
      // EmbeddedNestedString string field
     string EmbeddedNestedString = 1 [(gogoproto.jsontag) = "embedded_nested_string"];
   }
-
diff --git a/test/test_terraform.go b/test/test_terraform.go
index 2f3f019..e1a3e18 100644
--- a/test/test_terraform.go
+++ b/test/test_terraform.go
@@ -434,6 +434,7 @@ func GenSchemaTest(ctx context.Context) (github_com_hashicorp_terraform_plugin_f
 			Optional:    true,
 			Type:        github_com_hashicorp_terraform_plugin_framework_types.ListType{ElemType: github_com_hashicorp_terraform_plugin_framework_types.StringType},
 		},
+		"string_override": GenSchemaStringCustom(ctx),
 		"timestamp": {
 			Description: "Timestamp time.Time field",
 			Optional:    true,
@@ -2101,6 +2102,13 @@ func CopyTestFromTerraform(_ context.Context, tf github_com_hashicorp_terraform_
 			}
 		}
 	}
+	{
+		a, ok := tf.Attrs["string_override"]
+		if !ok {
+			diags.Append(attrReadMissingDiag{"Test.StringOverride"})
+		}
+		CopyFromStringCustom(diags, a, &obj.StringOverride)
+	}
 	{
 		a, ok := tf.Attrs["timestamp"]
 		if !ok {
@@ -4972,6 +4980,15 @@ func CopyTestToTerraform(ctx context.Context, obj *Test, tf *github_com_hashicor
 			}
 		}
 	}
+	{
+		t, ok := tf.AttrTypes["string_override"]
+		if !ok {
+			diags.Append(attrWriteMissingDiag{"Test.StringOverride"})
+		} else {
+			v := CopyToStringCustom(diags, obj.StringOverride, t, tf.Attrs["string_override"])
+			tf.Attrs["string_override"] = v
+		}
+	}
 	{
 		t, ok := tf.AttrTypes["timestamp"]
 		if !ok {