Wow, Dex mode is no longer limited to FHD using a normal type C to HDMI cord. Now,If they can make Dex mode work wirelessly on chromecast/google TV, that would be great. :
USB C Gigabit Ethernet Adapter with Charging Thunderbolt 3 to RJ45 with Type-C PD 100W dex dock for Chromecast Google TV - AliExpress
VLC dobio podršku za chromecast i Samsung DeX stanicu! - PametniTelefoni.rs
The Oculus Mega Quest 2.X Mixed Reality Monster featuring Chromecast Ultra and Samsung Dex in VR - YouTube
You can now enable Samsung screen mirroring on Chromecast and Android TVs - GSMArena.com news