This did it for me! Thani you so much for pointing that out.
Looks like this:
struct ExampleIntent: AppIntent & LiveActivityIntent { ...
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Thank you very much for this workaround!
What is the intended implementation for something like a selection highlight?
Seems to me we can only tuck on an .id or maybe custom modifier
or
track the selection state in the data elements them self, but that seems not so clean to me.