I was in the same boat at you and I found it super easy to use ST as the hub and HA as the brains until I decided to get Z-Wave/Zigbee dongles for my HA.

That said, I went to find the instructions to do it and it appears that Samsung broke the integration about a year ago and there still isn’t a solution. I’m sorry, it seems like I migrated fully just a few months before it stopped working and that explains the 1 device I still had on ST stopping working about a year ago (it wasn’t important and I never tracked it down).