Question

Do you have an external Apple TV box? Identify your Apple TV model - Apple Support

Do you have a model TV that supports the Apple TV app natively among its smart apps?

Watch on LG Smart TVs - Apple Support

List of Apple TV app-supported devices - Apple

if your tv is on the list Apple TV app - Devices - Apple

then I guess you can get the app from the app store on the tv

otherwise you will have to get an appletv box and connect it to the hdmi port of the tv