Default to gRPC path if no mapping is provided

[Kryan90]

I am using protoc-gen-openapi to generate api docs. The project is being built using connectrpc which uses GRPC_SERVICE_FULL_NAME/METHOD_NAME for paths.

We are currently adding this manually for each method, ie.

service MyService {
  rpc Foo(FooRequest) returns (FooResponse) {
    option (google.api.http) = {
      post: "/my.package.v1.MyService/Foo"
      body: "*"
    };
  }
}

Is there an existing way to use the GRPC_SERVICE_FULL_NAME/METHOD_NAME as a default? If not is that something you would consider adding? There is some precedence for this usage in Cloud Endpoints transcoding https://cloud.google.com/endpoints/docs/grpc/transcoding#where_to_configure_transcoding