For now, you can assign a boolean to a layer to set its visibility.

I’ve seen several posts requesting the ability to negate the value.

I would argue that it would be more beneficial to extend this request to using operators:

This way, you could do oif myVariable == true], ,if myVariable != true], ,if myVariable == false], ,if myVariable == “step1”], �if myVariable != “step1”], tif myVariable > 3] etc.