Configure email notification subjects

Is it possible to configure the subjects of the email notifications sent by a self-managed Gitlab installation?

The aim would be to add a nomenclature with specific code for commits, comments, pull requests etc. to the email subject.
And to be able to indicate the name of the group and the name of the project afterwards.

For example, for a PR :

[group_name/project_name] PR - Pull request object

for an issue:

[group_name/project_name] IS - Object of the issue

Thanx for your help and links to ressources.