You can install the latest Android TV version of YouTube from apk mirror:
https://www.apkmirror.com/apk/google-inc/youtube-for-android-tv-android-tv/youtube-for-android-tv-android-tv-2-02-08-release/
It says this: Download
This release comes in several variants. Consult our handy FAQ to see which download is right for you.
Requires Android TV
These require Android TV and can not be installed on your phone or tablet.
I don't dare using it now.
Install the arm version (not arm64), it's working fine on my Q10.
Why would I recommend something that wouldn't work?