The community driver/app combo for Kasa integration is top notch and the dev behind it is very active and responsive to people's feedback and issues. I have 3 HS220s and a pair of HS110s and they work great with his driver/app combo. Tons of features and highly configurable down to near real time polling if you need that for some application.
There is also a community driver for the harmony hub which may serve your purpose, I personally have not used it as I do not have a Harmony setup in the same home as the Hubitat, but based on a cursory overview if the harmony can be linked into Hubitat and kasa can be linked as well, then I would assume that Hubitat can serve as their bridge, but again I have not used it so you may want to ask over there.
Recently I have been debating switching from wifi based devices all together trading in the Kasa dimmers for Inovelli or Caséta. I think I am going to give Inovelli a test run due to the cheaper upfront cost and larger feature set of the Red series, but if I run into issues I will most likely buy more Lutron and use my pro hub for more than just picos haha.
