I am seeking a solution that will enable me to mirror the screen from Android (LineageOS 20) to Android TV (LineageOS 20 for Android TV). Chromecast is only accessible for Google-certified devices; therefore, Chromecast will not function here.
Is there a project in which I can install the receiver app on the Android TV and the client app on the Android phone to accomplish this?
You can attach a Linux, Windows or macOS box and run https://github.com/genymobile/scrcpy/
Maybe https://github.com/MayaPosch/NymphCast is also an option.