Question CopyPhysicsVelocityToSmoothing jobs in 0.51

Hi
Since the AddInputDependency has been removed, i am struggling to do something specific with jobs.

I am doing some explosion jobs which modify velocities on newly created objects. In the old way i would schedule the jobs to complete before CopyPhysicsVelocityToSmoothing.

First explosion job would be scheduled like this
JobHandle handle1 = buildPhysicsWorld.GetOutputDependency();
JobHandle handle2 = exportPhysicsWorldSystem.GetOutputDependency();
JobHandle = combine1and2JobHandle.CombineDependencies(handle1, handle2);
JobHandle newJobGroup = job.Schedule(combine1and2);


And at the end:
copyPhysicsVelocityToSmoothingRef.AddInputDependency(Dependency);
endFramePhysicsSystem.AddInputDependency(Dependency);


How do i do this now?
The RegisterPhysicsRuntimeSystemReadWrite does what exactly for such a case?

Thank you!