RCT Builder Need Help With Registry Query

Does anyone know how to use RCT Builder to query if a Registry Key/String exists and if missing add a new entry? It looks like the setting are there but I have had no success using them or cannot find any guide on how to use it.

I don’t have the answer as I haven’t gotten around to creating an action with this, but I’m 100% sure I will need this in the future, so if you figured it out, please share.