Pass automation variables to Run Automation action

When using a "Run Automation" action to nest an automation within the flow of another automation it would be very helpful and powerful to be able to set the value(s) of the automation Variables of the called nested automation. I envisage this would work similarly to the way variables are passed to "Run Script" actions, where the variables are mapped to automation variables of the calling automation. This would allow for making more complicated and advanced reusable automation components.