I think that would a good separation of concerns, I didn't know Kong, but it seems that is more specialised tool supporting Oauth2, Rate limit, Ip filtering ..etc via plugins. I would like to see both tools running in Docker and working together. I started this public gist to explore this solution https://gist.github.com/alfonsodev/6a6c66b4074248ed9702 feel free to comment and collaborate there.

Kong is great but adds dependencies to the project (I don't really want to deploy bloody Cassandra for a small API).

And it would be great to have 3rd party logins working in Kong