TV App Format Options

I have been buying HD format movies for a while, and whenever I redeem a code for a Digital movie included with a Blu-Ray, I get the HD version of course. However, I also own the movie in SD format too, as a result. I like to watch my movies on my iPhone 6, but the HD format would take up way too much storage space for offline downloading. I usually use the iTunes Store app and search for the movie I want downloaded, then I select the SD format and download it to my phone.

While it is an effective method, I believe it would be much more convenient if the TV app let you choose between HD or SD format (if both options are available). I prefer not to have the iTunes Store app enabled all the time, so I would prefer to download movies to my phone through the TV app, without having to download HD only if I can help it. Would you please add this feature in your next update?

Thanks in advance!

Paul