This request will be considered in a future release.
The best way to do this now (for actors or roads), is to script it in a for loop etc. using the programmatic drivingScenario API. This gives you full control and you can save the script or function you use as some sort of a template for your future work. After producing the drivingScenario object from the script or function, use:
and bring that to the App. Then move on to the next steps in your workflow.