Personally I always really enjoyed seeing the rare drops come over the yell to everyone. It made the thrill of grinding a boss that much more worth it, plus it puts some respek on your name
Are you suggesting this in leu or in addition to the boss slay announcement.
I'm in support of the idea, my only concern would be adding extera clutter to the chat notifications which waters down the premium yell benefit (assuming it will be a prem feature)
Purhaps it gets added to the slay announcement:
Black Knight Titan has been defeated by Eydrian. Loot: Dragon 2H Sword