I use a Xiaomi 11t pro for almost 5 years now. The native camera app was really good in my opinion. This post is me suggesting that the camera app should provide the expert mode for video as well. I am right now using the nothing 3a.
In my opinion sound gain meter is good to thing to be implement, so u could monitor the sound.

Please also put in the camera setting where we can choose to use external mic or built in mic. Thank you.
All this is just my suggestion.