Is it possible to call Laravel Passport Controller methods without using GuzzleHttp or Proxy in general?

Hi,

I just started learning Laravel and am having a tough time handling authentication. I am building a web app with Vue as front-end. Somehow I managed to solve the basic authentication issues. But now I want to send User details and OAuth2 tokens when the user login. So my login controller class has this method to send out response

    protected function authenticated(Request $request, $user)
    {
          $http = new \GuzzleHttp\Client([
                              'base_uri' => config('app.url'),
                              'timeout' => 10,
                        ]);

          $response = $http->post('/oauth/token', [
                                           'form_params' => [
                                                 'grant_type' => 'password',
                                                 'client_id' => '123',
                                                 'client_secret' => 'P*************************************************E',
                                                 'username' => $request->input('email'),
                                                 'password' => $request->input('password'),
                                                 'scope' => '',
                                            ],
                                    ]);

         //TODO return array_merge of $user values and $response->getBody()

          // Now I am just sending out true to avoid page redirects as all my forms
          // are submitted through AJAX

          return true;
     }

How can I merge the two responses together and send out response as JSON? The $user param is of type \Illuminate\Contracts\Auth\Authenticatable.

Moreover GuzzleHttp client seems to be very slow, so I'd like to remove this and directly access the '/oauth/token' controller methods. Is this possible? Or is there any other better ways to handle this situation.