Hi , I’ve been working with Oathkeeper's gRPC middleware and trying to use the

id_token

mutator to inject a JWT into the request metadata. Despite correct rule matching and a permissive setup, the JWT is not being issued. But i am able to issue a jwt using id_token mutator if i am using ory oathkeeper as a standalone service. Is this feature not supported in oathkeeper grpc middleware? Thanks in advance