Using the same test file on an i7-7700
Converting 20 Mbps HEVC HDR (10 bit) to 720p 4 Mbps SDR
It seems you have no choice but to wait until Intel releases the update for the drivers for that proper video quality.
The J4xxx CPUs are provisionally supported when the i965 workaround is in use. It isn’t ‘fully supported’ operation but otherwise enough to get by.
