Ciao ​@wangtel. Have you ever been able to see the POI on your Instagram?

The flyover you watch is animated in real time in your phone. The file created and shared to Instagram is a video rendered on their server somewhere by a different method. I haven't seen anything specifically about how it's generated but I don't think there's anything we can do on the user side. Maybe you can suggest POIs and other markers (akin to Relive) as a feature. 

I haven't seen any POI on my Instagram which were shared from Strava Flyover.