Kong as Restful Api Gateway for Grpc microservices

I am currently working on microservices where each service is written in grpc in ruby. The problem I am facing is with the API gateway. I would like to know if Kong provides the feature to route the grpc service as a restful API.
There is also an authentication plugin in kong. Is this done through the Postgress DB/ Casandra where all Users are stored there? Currently, there is a separate Auth service with RBAC feature so should we migrate it to Kong?