Ensure correct slide index in renamed slides

I would like to rename ‘Slide 2’ to ‘2 my slide title’ in my Impress presentation. Unfortunately, when I add slide before, renamed slide index in slide name is no longer updated. Is it possible to solve this? I would like to have possibility rename my slide for example like this: “%g my slide title”. Then slide index would be updated when slides count change.

Probably a summary slide is useful for you. Summary slides reproduce the titles of your slides. They seem not to be dynamic, as you stated in your comment, so you have to generate them after finishing your presentation.
The titles/headlines are not linked to the single slides.

The summary slide is inserted at the end of the presentation. You easily can move it to the beginning…