You could try using an external microphone.
There is a topic about using an USB microphone (Shure MV88+) for the FP3.
Unfortunately the user didn’t come back with her experience so far.
I just reopened the topic and asked for some report.
(Though it’s not exactly a cheap solution at about 200 Euro for the video kit with table stand. I guess there might be cheaper ones available as well.)
Edit:
Here’s for example the product page of Rode with microphones for mobile devices. (Because some Rode mics were discussed for the FP2 if I recall it correctly).
I found the vlogger kit from that page to be available from around 160 Euro.
But I have no idea of course, if that’s going to work.
Another possible example might be the “beyerdynamic FOX”. One user report on that page is stating to use it for video-calls/conferences. For Android an OTG-cable is needed.