Use mailable with (mailjet) API

Hi. I wanted to send mails with mailjet and mailjet templates. Mailjet offers a way to design templates in the service, that no developer is needed for changes. So I dont need the views and design to make in laravel. I only send an ID to Mailjet, which template to use and send also variables if needed. My question is, is it still ok to use mailables? I did a check and it work. And maybe you say, yes this is the right way, but I wanted to know that it is not wrong or you say "dont do it, because of...". This is what I have and works:

class TestMail extends Mailable
{
    use Queueable, SerializesModels;

    /**
     * Create a new message instance.
     *
     * @return void
     */
    public function __construct()
    {
        //
    }

    public function send($mailer)
    {
        $mj = Mailjet::getClient();
        $body = [
            'FromEmail' => "[email protected]",
            'FromName' => "John",
            'Subject' => "My Testmail",
            'MJ-TemplateID' => 1234567,
            'Recipients' => [['Email' => "[email protected]"]]
        ];
        $response =  $mj->post(Resources::$Email, ['body' => $body]);
        $response->success() && var_dump($response->getData());
    }
}

For me it makes sense to use Mailables, because I have an overview and when I change someday I can change all at once instead of searching my mail code in the whole code. Is it ok to overwrite the send method?