I tried with other HD TV
not HDR (only 1080p) to check the color space setting.
and the HiMedia, and it was set by default YCbCr422.
So I tried to select YCbCr420 8 bits and YCbCr420 10 bits and gave me the following message.
Does this mean that the YCbCr420 8 bits and YCbCr420 10 bits color spaces are only reserved for 4KP50 and 4KP60 systems, so YCbCr422 is a color space only for Hd and not UHD.
However, I think that the color space adapts automatically according to the output signal and the connected display.
The problem is that I can not verify it while playing a movie, with the info button on the LG TV I get only this information