I actually tried to use the solution from this post:
But it does not seem to work. Any other way to change/update fields based on people being in specific groups?
Actually, I'd use much the same code. But what you've found is 3.5 years old (or 3 JIRA versions) and JIRA has changed since then, so it needs revising. (Specifically, the component manager stuff and the calls to user/group code has changed. I think the label related code is actually ok)
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