More information on this one if @rVn not sure what we mean by that. Currently, there is a function in vehicle script class

override int GetAnimInstance()
{
       return VehicleAnimInstances.HATCHBACK;
}

In order to add a new instance, it requires us to edit an animation table (player_main.ast, player_main.asi and vehicles.agr files)

Best way from my perspective would be to do something as we have with ik animation profiles, something like this would be great

override int GetAnimInstance()
{
       return AddVehicleProfile(this, "dz/anims/player/vehicles/hatchback/hatchback.asi");
}