Hmm, I don’t think something like this exists out of the box, and there seems to be an older feature request for it too Moderator message option with approved flags? (add your vote to it!)
Atm, you would need an external automation + webhook setup to accomplish this.
That being said, we are working internally on a really cool feature that would be the answer here, but not sure how much we’re disclosing yet about this @mcwumbly 