go-proto-validators | Generate message validators from .proto annotations | Serialization library

I am looking for a way to rate-limit RPCs separately with high granularity, and to my dismay, there are not many options available for this issue. I am trying to replace a REST API with gRPC, and one of the most important features for me was the ability to add middleware for each route. Unfortunately, go-grpc-middleware only applies middleware to an entire server.

In my imagination, an ideal rate-limiting middleware for gRPC would use similar tricks as go-proto-validators, where the proto file would contain configurations for the ratelimiting itself.