Been trying to figure this out, too. I haven’t fully tested it yet, but my thread: VZW31-SN: Per LED with Effects - What comes first? HAS YAML code for bulk set parameters.
I made myself a spreadsheet of what parameter to set for each one. It calls multiple switches via bulk_set_parameter commands to sync them all, then queue the “notification” via the set duration effect parameter.
If I get this working and have time (currently have a newborn), I’d like to learn how to set up blueprints to make this easier.