If you want to give your Akkoma users an XMPP (chat) account, you can configure [MongooseIM](https://github.com/esl/MongooseIM) to use your Akkoma server for user authentication, automatically giving every local user an XMPP account.
In general, you just have to follow the configuration described at [https://mongooseim.readthedocs.io/en/latest/authentication-backends/HTTP-authentication-module/](https://mongooseim.readthedocs.io/en/latest/authentication-backends/HTTP-authentication-module/) and do these changes to your mongooseim.cfg.