Recently, the --pyi_out flag was added to protoc, which is really great. I have a project where protos are compiled using bazel/py_proto_library. From everything that I have seen, there is no ability to additionally generate the .pyi files using this mode.

• is it currently possible to generate .pyi files using py_proto_library? if so, how?
• if not, what would be a path to add this support? I'm happy to make a PR (with maybe a few pointers)

thanks!