Brightness up/down on a group with Wifi and Zigbee lights?

I have a IKEA Styrbar controller that I’d like to use to control for light control - calling scenes and dimming. I see several blueprints for zigbee lights BUT my living room group consists of both Zigbee and Wifi (Yeelight) lights.

How do I write an automation to increase and decrease brightness of the entire mixed group? I thought there was a service to do that but there’s not. Any tips? Thanks.

nobody doing this? looks like a basic thing