Set system variable in connector Api URL

hi All,
I would like to use the system variable and use it as dynamic value for the connector Api URL.
Any idea on this?

There is an old forum thread that might be helpful. Here’s the link: https://groups.google.com/g/camunda-bpm-users/c/3oDUtmurBI4/m/-UoqOVy4dS4J?pli=1