Can I watch my Apple TV subscription on my lg to

Get the Apple TV app or Apple TV+ app on your smart TV, streaming device, or game console - Apple Support

Apple TV+ subscriptions are tied to an Apple ID and not to a device, and logging in with that same Apple ID will have the subscription available.

If the particular LG TV here has the Apple TV app available for download, that will work for Apple TV+ content.

Otherwise, you will need a source. The source might be Apple TV 4K or HD, or a cable from an iPhone or iPad, or potentially via AirPlay 2 if that is available.