Override to implement your custom JWT manager instance

            :param app: Flask app

def create_jwt_manager(self, app) -> JWTManager:
        """
            Override to implement your custom JWT manager instance

            :param app: Flask app
        """
        jwt_manager = JWTManager()
        jwt_manager.init_app(app)
        jwt_manager.user_loader_callback_loader(self.load_user)
        return jwt_manager