Signal expressions - ExecutionEntity vs. DelegateExecution

I am using an expression on the signal name as documented here:

I want to use the current value of a process variable for correlation, so I write something like “mySignal_${foo}”, but it fails stating that foo cannot be resolved.

From the error I got the impression that we do not have the full DelegateExecution scope at hand here but only a ExecutionEntity. Is this observation correct? If so: why? If not: do you have any examples for signal expressions that go beyound using the businessKey or the processInstanceId for correlation?

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