I'm wondering if OpenAPI annotations or some other service-level documentation is supported when using gRPC for Cloud Endpoints.
It seems the api yaml config requires a Rules reference which has no notion of description, etc. Is there a way to annotate either a proto file with a description/title or other OpenAPI attributes, or add this customization to the api config yaml file in addition to http rules? In reviewing
https://cloud.google.com/endpoints/docs/openapi/dev-portal-add-custom-docs that seems more like adding new pages or customizing the portal, not annotating messages or methods.