How to add custom fields to logged user to vue side?

In my Laravel 5.8 / vuejs 2.6 / vuex 3.1 I want to add custom fields to logged user based on personal data and methods defined in user Model I use next method which is called from login.vue page:

export function login(credentials) {
    return new Promise((res, rej) => {
        axios.post('/api/auth/login', credentials)
            .then((response) => {
                console.log("+++ credentials::")
                console.log( credentials )

                console.log("+++ response::")
                console.log( response )
                setAuthorizationToken(response.data.access_token);
                res(response.data);
            })
            .catch((err) =>{
                rej("Wrong email or password");
            })
    })
}

and standart app/Http/Controllers/Auth/LoginController.php file, where login method ios not defined. How can I on laravel side catch after login event, assign custom fields and return them to Promise method above ?

via Chebli Mohamed