A Chromecast remote could be in the works with new Bluetooth abilities
Best Buy: Google Chromecast Ultra 4K Streaming Media Player Black NC2-6A5-D
Google Planning to Release New Chromecast With Bluetooth Enabled | Beebom
Stadia now allows you to use your mobile as a touch control to play on TV or use Bluetooth controls on your Chromecast Ultra - How smart Technology changing lives
Use Bluetooth Headphones with a Chromecast | Tech for Luddites