How can I import static file to populate message in controller?

I have a Laravel API project where I want to hardcode response messages and to reuse them in any controller, How can I achieve this?

I have created response.php under APPTraits folder which has below code:

<php 
    return = [ 'success' => 'Response successfull!!!', 'error' => 'Error Authenticating']
?>

In my controller I tried to import via construct function, its now working:

    use AppTraitsresponse;
    public function __construct( response $response) {
        $this->response = $respose;
    }

$this->response->success;  // outputs message

Please help me. I wanted to understand how do we import such files, JSONs or any other utility function to reuse?