Stream isolation of different apps in Orbot VPN mode

It appears that Orbot (at least when running in Apps VPN mode) does not isolate the traffic of apps, i.e. relaying it to different exit nodes; multiple (even all?) have the same public IP address . At the same time Orbot obviously *can* do stream isolation when an app is properly configured (like Orfox) and the traffic of each app can be handled separately by the VPN.

Am I correct? What needs to be done to implement per-app stream isolation in Orbot?