How to read the camunda variables of "callActivity multi-instance child processes" in Parent process?

[firstpostcommenter]

Hi,
I am able to trigger multi-instance child Camunda processes using callActivity as shown here How to trigger callActivity with a list of business keys?.

Each of these sub processes creates Camunda variables. Once all the child processes are completed, how can I read these camunda variables inside the Parent Camunda process delegate?

Do I have to manually append some loopcounter to the camunda variable name in the child process, or is there any option in Camunda itself (in variable mappings) to consolidate the process variables of child processes before returning the control to Parent process (variable propagation from child to Parent process but with loop counter appended for example)?

(Variables | Camunda 8 Docs)

[firstpostcommenter]

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Execution listener itseems.

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