I have moved my LG UltraFine 32UN880-B monitor, where it is now close to my Kitchen Apple TV.
This monitor has 2x HDMI ports, though neither are labelled as HDMI ARC or eARC.
The Apple TV 4K itself only has 1 HDMI port.
And my JBL 2.0 All In One Soundbar also has 1 HDMI port, which is labelled...