Allow group control based on specific entity

At the moment, groups either have control hidden or no entry at all.
I’d like to see the option to put an entity id in that instead of “hidden”.

In my case I have a “general” Sabbath mode switch, and then a few more booleans specifying if guests will be coming or if we’ll be eating out some of the meals.

I want the switch for the group to represent whether Sabbath mode is turned on, irrelevant of whether any of other booleans are turned on or off.