Cannot set an httpOnly cookie from python GRPC server. Envoy configs not correct?

Title: Cannot set an httpOnly cookie from python GRPC server. Envoy configs not correct?

Description:
I am trying to set an httpOnly Authorization cookie from my gRPC python server through an envoy proxy and back to my ReactJS front-end client running grpc-web. Currently, I can send a JWT back in a response, set it into local storage, and append it onto subsequent calls using a client side grpc-web-interceptor; however, I do know that using local storage for a JWT is not best practice. How can I make it so that running context.set_trailing_metadata('set-cookie', 'mycookie') from my python gRPC server actually set the cookie, because currently I do not see anything in the storage tag of development tools but I also simultaneously see the response cookie when checking the API call in the response tab.

Also, would it be possible to make envoy grab the authorization cookie on every request if it is there? I have read so many posts, but none of them match what I need to achieve.