External Task Client: Query Process Variables used?

Hey there,

i am confronted the following process model, in which an external task pushes work items to the queue called “testTopic”.

In the external task client that runs as separte spring boot application, I am using the following for this task’s completion:

Note that I registered the variable “var_1” as process variable in the extension’s part of the camunda modeler.

The question is, whether I can somehow retrieve the process variable that is consumed by this specific worker from the process engine? Is there any way to query the variables used by the external task client for a specific topic? In this case, I’d be interested in retrieving the information that the external task client uses the variable “var_1” for the topic “testTopic” as input. Any chance to get this?

Thank you in advance!