Span a note across the width of a group in sequence diagrams

Question

Hi, it would be helpfull to be able to have notes that span across the width of, all kinds of, groups.

That would mean a notation like:

note across group: 

I am aware this can be done manually by specifying note over pariticipant#1, pariticipant#X.... but this adds overhead and complexity especially when you reorder the participants