Okay, with the help of chatgpt and vibe coding, I was able to custom code this functionality.

Use (trigger=some general idea of subject matter) to specify the subject matter of the trigger.

(Replace parentheses with brackets and close the triggering content with the end trigger code as you normally would (/trigger).)

This is not a requirement for use of the trigger bb code. If you don't want to specify the subject matter, that's perfectly okay. But your fellow members would appreciate your using it going forward.