I have a Samsung Q800A soundbar. It ships with built-in support for the Apple Airplay protocol, but I’m not really an Apple kind of guy so that’s never been particularly helpful for me. So, instead, I have a Chromecast Audio plugged into it via TOSLINK, and that works fine - except for the fact that there’s no way to explicitly pick TOSLINK as the audio input. Instead, there’s a “Digital In” option that refers to both the optical in and eARC input from a TV.