AFAIK this only concerns casting TO a chromecast (or miracast) enabled device, which has been possible for a while now (the new part being the support for it in this desktop application), but you can't make a device a chromecast receiver because that part is proprietary.
You can set up your rpi as a miracast receiver or use sunshine/moonlight to stream your whole phone screen / pc monitor to your rpi, but the ability to just press "cast" on your phone and then do whatever else on it while the content plays on your TV is sadly locked behind the proprietary walls of google / apple
GNOME Network Displays is the software that allows streaming your GNOME desktop to WiFi Display devices using PipeWire.
Last week GNOME Network Displays 0.91 was released with some big improvements to this software.
The v0.91 release also has various bug fixes and updated translations.
GNOME Network Displays 0.91.0 ============================= * Add support for Miracast over Infrastructure (MICE) protocol (@lorbus) * Add support for Chromecast protocol (@kyteinsky) * Add support for casting a virtual screen (@NaheemSays) * Fix various issues * Add/update various translations The MICE support had been under review for two years.
This has been successfully tested to stream to an LG WebOS smart TV over Ethernet and WiFi.
MICE allows for Miracast over LAN rather than using WiFi Direct.
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You can just download the app from Flathub right now and it should hopefully make its way directly into GNOME in the future. At least some work was being done to implement this directly into it.
The application will stream the selected monitor if the mutter screencast
portal is available. If it is unavailable, a fallback to X11 based frame
grabbing will happen. As such, it should work fine in almost all setups.