Can the AOSP img included in the SFOS installer zip be modified?

Can the AOSP img included in the SFOS installer zip be modified? I’m looking to add the contents of this: GitHub - KhushrajRathod/VoLTE-Fix: Fixes Qualcomm VoLTE on all GSI Treble Roms to SailfishOS to try to force VoLTE to function.