Updated 01/08/20: An Apple press release states that Sony and Vizio TVs will also get the TV app this year, though no specific dates or models are mentioned.
At the CES show last year, LG (along with other TV manufacturers) announced that many of its new TV models would support HomeKit and AirPlay 2. This year, the company is going much further. In a press release announcing its new 2020 TV models, LG announced that the Apple TV app is coming to the webOS smart TV platform.