@noggin is right, there's no colorspace switching on the NVIDIA Shield but there is a much better conversion that is occurring now. I can't tell a difference anymore, and previously I could notice the difference right off.
Denon X6500H 7.2.4 -> LG OLED65C9P
Main: NVIDIA Shield Pro (2019) Other Devices: Apple TV 4K, FireStick 4K Max (2023), Homatics Box R 4K Retired devices: Zidoo X9S, Xiaomi Mi Box, All the old RPi’s