I don't know Lua that well or this platform well enough to test it, otherwise I'd definitely do this myself; however, this is just an idea. If Warrior / Pally tanks are disarmed or stunned, then it's difficult for us to generate threat.

I've been really liking https://www.curseforge.com/wow/addons/loss-of-control-announcer

There's a couple other addons that do something similar, not sure if I could recommend them in-game, or if I want to duplicate their work here. Leaning toward the former.