Get typed AST from Rescript file

I believe I want to do the reverse of How do I extract the rescript AST?

I have a Rescript file and I want to inspect the (typed) AST of a file.
How can I do this? I don’t really know any ocaml, so if I can just dump something to json that would be ideal. But if that is not possible, some ocaml pointers would do as well.