Basically I have a single gang with two half switches in what is the same space normally a single switch would be. Each switch controls a different light. I’d like to make each light smart separately.
They are LED lights in the ceiling, so I can’t just use smart bulbs.
The Zooz Zen 30 is the only one I am aware of. One of the switches is a dimmer and one is just a button relay. It seems to be mostly designed to control a light and a fan but it does say on that website that you could use it for two lights as well.
I think you'll be happy with the Zooz Zen30 as @kyroha recommended.
I currently use for my patio setup (paddle for traditional wall fixture and the secondary switch as a virtual switch for string lights on a outdoor module). The built-in Zooz Double Switch driver has the all the parameters built into the preferences so you can adjust settings to your use case.