Conditional number of forks for parallel gateway

[tim-boerner]

I am currently migrating very old jbpm workflows to camunda 7 and got stuck at one point.
I need to model a workflow which creates one task for each user group and each task needs to be completed before the workflow proceeds. So it is basically a parallel gateway with fork and join, like so:

At design time, i do not know the number of user groups. So the list of user groups will be stored at a process variable. But how can i create forks based on the list of user groups?

[tim-boerner]

checking Documentation often helps
the keyword seems to be " Multiple Instance task markers"

Task Markers | docs.camunda.org