Vertical Video's Thumbnail is not shown correctly in YouTube!!!

Hey guys,

I'm creating Kingshot Videos (Mobile Game), so obviously the video is in a 9:16 ratio.
However, the standard Long Video Thumbnail ratio on YouTube is 16:9.

This is fine if viewers find the video in Search or on my channel.

But the video in subscribers' feed is terrible!!!!!

https://preview.redd.it/1rsq5bo8g8rh1.png?width=577&format=png&auto=webp&s=4e48297d26ea95e24af27631e258e4466782ce6a

ANY SOLUTION for this????

• I cannot fit everything in the middle of the thumbnail cause they will be super small in a 16:9 ratio.

• I cannot record the video in 16:9, cause the video becomes super small and barely visible for viewer who watch on their phone!

This is really bothering me! I would appreciate any help.
This is how it should be displayed!!!

https://preview.redd.it/ped1l6zbg8rh1.png?width=1093&format=png&auto=webp&s=676b49fd054c74e5799bd23d0f7d2b52add6af6a