Samsung Smartthings TuneIn Radio link

I have a Samsung HW-Q70R soundbar. Currently I use the Samsung SmartThings app - TuneIn radio is integrated and works fine. I would like to get some buttons on my dashboard for certain radiostations - these buttons should send a signal towards the soundbar.

I’ve tried several things, but nothing seems to work. My best try was following this tutorial but it didn’t work: Home Assistant How To - get Radio Stations integrated

Anyone can help?