customize the body of the email

Hello, I use Nextcloud as a container for the documents produced by my office for all my clients who are Nextcloud users. I use notifications to send an email to each client/user as soon as I upload a document to their shared folder. It would be helpful to be able to customize the body text of the email sent by the notification system. Is it already possible? Thank you.

Do you know the App Mail Notifier - mailnotifier:

   App-ID          mailnotifier
   App-Name        Mail Notifier
   Summary         Send Mail Notification
   Category(s)     workflow
   App-Version     0.0.3
   NC min/max      25 / 26

The interface is French, but that shouldn’t be a problem. It allows you to create individual texts.