Customization on Performance Document notification title

Hello, fellow consultants

I'm trying to do some customization on the title of the notification below (for both bpm notifications and the subject of the notification email sent to the users).

From what I could notice, this title is dinamycally generated and somehow is able to retrieve the information on what the current notification is about in order to decide the displayed text (document creation, deletion, participant feedback request, etc). In our client's request the title that we need to create doesn't have much of a standard I can use that will fit all the different notification types in this task.