How to get multiple Variables from process with the topic subscription builder?

Camunda 7 Topics
1

Hi, I would like to implement a process with an external task. For this I need the global variables.
This ist the current state:

Topic subscription subscription = client.subscribe(...).variables("?").handler((externalTask, externalTaskService) -> { Map<String, Objekt> InputVar = externalTask.getAllVariables(); externalTaskService.complete(externalTask); }).includeExtensionProperties(true).open()

If I just write a variable name in variables() this works. How do I write the names in the string so that I get all of them?
I also tried with the Extension properties but externalTask.getExtensionProperties() only returned an empty map.

Thx for any help!

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