I might be misunderstanding what you're asking, but VSCode already makes regions foldable by default.
That said, my extension does support regions in more languages than VSCode currently supports, so maybe you're thinking of a particular language in which VSCode doesn't make regions foldable, that my extension could fill the gap for?
That said, my extension does support regions in more languages than VSCode currently supports, so maybe you're thinking of a particular language in which VSCode doesn't make regions foldable, that my extension could fill the gap for?