Auto labeling

Hello

I created some library elements. When I drag an element into the schematic, the component is not automatically labeled.
When I drag an element into the schematic from the official QET-Libarary, labeling works fine.

When I copy an element from the official libarary in my custom folder, labeling also does not work.

If possible, I would like to label my elements like

-KF01..
-MA01...
-QA01..
and so on.

Is there a way to set up QET so that components are automatically labeled like this?
Best regards
Geri