Laravel 5 dingo api, add multiple transformed objects to the response

Want to add a transformed object along with other response, I have used following code:

$accessToken = Authorizer::issueAccessToken();

    $user = User::where('email', $request->get('username'))->with('profile')->first();
    if ($user) {
        $accessToken['user'] = $this->response->item($user, new UserTransformer);
    }

    return $accessToken;

Expected Response:

{
    "access_token": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
    "token_type": "Bearer",
    "expires_in": 31536000,
    "data": {
      "id": 1,
      "email": "xxxxx",
      "profile": {
        "data": {
          "id": 1,
          "first_name": "Muhammad",
          "last_name": "Shakeel",
        }
      }
    }
}

but not getting transformed object, there must be some better way to add multiple transformed objects with response. Am I missing something?

via Chebli Mohamed