I put a feature in MO 4Media v1.10 for Android TV that flew under the radar. It allows you to have direct video links to external streaming apps for playback. To do this you import a placeholder video into MC and put a special URL in the Web Media URL field for that file.
For example, I have Star Wars in streaming version only. I want to see it with the rest of my movies and be able to play it from MO. So, I imported a short placeholder video and downloaded the movie info for Star Wars inside MC for that file. I then put the Apple TV URL below into the Web Media URL field.
Now when I go to play the movie in MO on Android TV it will launch the Apple TV app right to the Star Wars movie where I can play it. You have to manually retrieve the ids for each video from the web site for the service. Hopefully someone else will find it useful too.
Working on my Shield TV
Apple TV: Star Wars
https://tv.apple.com/us/movie/star-wars-a-new-hope/umc.cmc.2o65qvudvwq1l1rqjlbyfszwn
Netflix: Escape From Planet Earth
https://www.netflix.com/watch/70244165
Hulu: The Bounty Hunter
https://www.hulu.com/watch/the-bounty-hunter-882cd29c-87c9-4525-8476-83c34c461064
Disney+: Thor
https://www.disneyplus.com/movies/thor/1p4vdKzTuhzr
This used to work, might still work if you have only 1 profile
Amazon: The Martian
https://watch.amazon.com/watch/asin=B017S3OP7A
Not able to test
HBO Max: Scoob!
https://play.hbomax.com/urn:hbo:feature:GXdu2ZAb9oJuAuwEAADa9