Mobile Home Screen Icon from 3rd Party Teams App

Recently, I discovered that from Teams you can create a shortcut of a personal app on your device home screen. Do you know how do I set the icon to appear? Is something to do with the manifest?

Our app is Teams native, meaning you can't find a web version of it outside Teams. Could that be the problem?

I searched in the documentation of MS but I couldn't find. Can someone point me at the right direction?