Properties group

Hello everyone
I’m wondering if there is a way to create a new personal group for specific properties ( also for shared parameters) like Dimensions group or Others group.
I searched through Revit UI but it seem to be not allowed. Maybe programmatically is possible through the API.
Can someone confirm?

I confirm it is not possible:

like categories, these are builtin and not editable, at least not that I know of. I could not find a method to do so in the api.

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It’s sad but it seems the case.
Thank you Jean-Marc