There is a plugin provided by better auth for jwt https://www.better-auth.com/docs/plugins/jwt
We dont need it since everything is a single "server" and cookies are good enough. JWT would be added complexity ( e.g sign out ) that i find it better to not be set as a default.
bonus reading http://cryto.net/~joepie91/blog/2016/06/19/stop-using-jwt-fo...