Cannot filter select options with value from previous select control when using Raw JSON Data types

[ajanickiv]

I have two select Boxes. Both use Raw JSON data. When the user selects a value in Select Box 1, I want to filter the options of Select Box 2.

Here is example data:
Select box 1:
[
{
"region": "A"
},
{
"region": "B"
}
]
Select box 2:
[
{
"region": "A",
"name": "NAME_ONE"
},
{
"region": "A",
"name": "NAME_TWO"
{
"region": "B",
"name": "NAME_THREE"
}
]

• User chooses "A" in select box 1, select box 2 should display "NAME_ONE" and "NAME_TWO"
• User chooses "B" in select box 1, select box 2 should display "NAME_THREE only

I see a Filter option for URL or Resource data, but that option is not available for the Raw JSON Data Source Type. How do I filter the data?