TV compatibility with Apple TV app.

Here is a list of compatible Apple TV app TV's: Apple TV app - Devices

It looks like the following LG TV's are supported:

Apple TV App–Supported Devices:

• LG OLED (2019)
• LG NanoCell SM9X series (2019)
• LG NanoCell SM85 series or above (2019)
• LG NanoCell SM83 series or below (2019)

AirPlay 2–Enabled TVs

• LG OLED (2019, 2020)2
• LG NanoCell NANO 9, 8 series (2020)2
• LG UHD UN 8 series (2020)2
• LG UHD UN 71 series or above (2020)2
• LG NanoCell SM 9, 8 series (2019)
• LG UHD UM 7, 6 series (2019)

I don't but the following (and/or the LC forum) may help: https://www.lg.com/us/support/help-library/apple-tv-app-launch-on-lg-smart-tvs-CT10000018-20151455238100