I previously contacted a Unity employee, who responded to the thread but hasn’t followed up since (which is understandable).
Could you please advise whom I should contact regarding the possibility of adding a feature to Unity namely an ‘Exclude’ mask feature in the 2D URP renderer, since this is not a bug report but more of a feature request?
the place for asking features is right here where u just posted
with that said, you shouldnt hold your breath for this, if ur request is even considered you should expect it 3 or 4 years down the line to be implemented