Start the call on a phone or PC
Open 4K Chat in a modern browser, start a call, and get the room link or code. The call runs from the device that started it.
Get it on a big screen
Start on your phone or PC, then put it on the TV. No store app required — and none exists today.
Mirror or cast to the TV
Use AirPlay, Chromecast, Miracast, or an HDMI cable to put the browser tab or your whole screen on the big display. Quality depends on the casting path and the TV.
No Smart TV store app today
There is no app to install on webOS, Tizen, Android TV, or tvOS yet. Casting or mirroring from a phone or PC is the honest path for now.
For the full framing and what works best, see Smart TV & big screen.