No neutral for add-on switch, will Smart Switch still work?

[JDRoberts]

FAQ: 2020 Ceiling Fan and Dimmer light wall mount control compatible with SmartThings and Alexa?

There is much said about light and fan controls, but I can’t find any specific brands that are listed. I find several light switches but not dimmers, and nothing listed as a fan control. Looked at the similar topic listed but it had no actual solution.