You can add channels to your Apple TV in many ways with the help of iOS devices. Before adding the TV channels, you have to consider the system requirements. An older Apple TV ( 3rd generation or earlier) will not support downloading TV apps that contain the TV channels. But if you wish to add the TV channels on your Apple TV 4K or 3rd generation Apple TV, follow the below-mentioned how to add channels to Apple tv steps.
Using the Apple TV app on your iOS device: