Is your feature request related to a problem? Please describe.
I'm always frustrated when [...] i want to anchor a specific texture to Unitframes/Nameplates and need to set the size based on the frame. That's why I need to use diffrent Auras for Group/Raid unitframes just because of the size.

Describe the solution you'd like
An option for "dynamic size".

Describe alternatives you've considered
"If condition" for raid/party to change size via condtions (if possible).
Maybe 4de847b can be used for that.

Additional context
Sketch of how it may work: GetSize of the anchor. SetSize to the region.

I think that's out of scope for the time being.

#2878 is a very similar ticket, that asks for this feature in the context of dynamic groups, and thus it's best to merge the tickets.