Oh, you sound like just the right person for me to brain-pick on :)
I too have a 4k LG HDR TV, the OLED55B6V from 2016. I've been using the internal player with DLNA to play back 4k UHD HDR rips, and it's been so-so. The quality, when it works, is fantastic. But she's a mean mistress, my LG...