1889188639
I had / have  this feature with my old "flagship" phone Galaxy S4 with Android 6
Works realy good, ...

You can always use Separate app for mic and then synchronize it in video editor. The minus of this is the thing is google api dont allow apps to use same source 2 times so u cant record your voice and use it to talk with someone (like on skype, discord or teamspeak etc.)