How to use notification template on command handle?

I have a command to send emails to users every week. on the command->handle() I can use

$user = User::find($this->argument('user'));
        Mail::to($user)->send(new PurchaseMail);

However, I would like to use the template of MailMessage which is meant to be use for notification like so.

    return (new MailMessage)
      ->subject(app_name() . ': ' . trans('exceptions.frontend.auth.confirmation.confirm'))
      ->line(trans('strings.emails.auth.click_to_confirm'))
      ->action(trans('buttons.emails.auth.confirm_account'), route('frontend.auth.account.confirm', $this->confirmation_code))
      ->line(trans('strings.emails.auth.thank_you_for_using_app'));

Can I return a MailMessage in handle method? If not, could you tell me how I can use it in handle method like I'm using

Mail::to($user)->send(new PurchaseMail);

thanks