From what I understand UHD premium requires 10 bit colour and additional dynamic range but not 422 which is just the way the colours are mapped on the frame. My understanding is that 422 is required mostly for grading but then once done you don’t see it.
My Tv LG OLEDB7V can display even 444 but the player can’t process the files
I use handbrake and with ffmpeg can also convert the camera files to prores free
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Do you mean the computer player when streaming from your computer to your Tv or the Tv player when you insert a hard drive or a USB on the TV?