Probably a better feature request would be to ask xLights to support whatever protocol Wiz uses. Poking around briefly seems to suggest that the bulbs use a proprietary format over http1. The good news is that it seems like this could be fairly simple to hack. The bad news is that it's probably not something the xLights devs would want to bake into xLights, since it's proprietary.
I too have Wiz lights, but I don't need to incorporate them into my show--instead I want to dim them when my show starts (kind of like house lights) and raise them at the end. So I'm thinking a script executed by FPP would serve my needs.
1https://github.com/zranger1/HubitatWizLightDriver/blob/master/wizProtocolNotes.txt
