This is a community plugin and is thus not built-in to Proto. In order to use it, first either add it to your global or project-based .prototools by running:
proto plugin add zola "source:https://raw.githubusercontent.com/z0rrn/proto-plugins/main/zola/plugin.toml" --global
proto install zolaproto plugin add zola "source:https://raw.githubusercontent.com/z0rrn/proto-plugins/main/zola/plugin.toml"
proto pin zola latest --resolve