No app. Not allowed to do screen mirroring
No there is no app for Nat Geo. You can use the BlueCurve app, Prime Video app, or watch on prime video.com.
Not been able to find bluecurve app on Apple TV. Not buying prime to watch a show that’s part of my package already. I’m going to assume there’s some license issues and it’s verboten. Like PBS on bluecurve, no can do as well. No idea why, never gets answered.
Sorry, totally misunderstood what you are trying to do. Ya there is no option for Apple TV other than Prime, you will need to watch it on your cable box.