Dynamic input for select box

[ThomasZ]

I am trying to fill the select values with dynamic values from my spring boot application. I set the variables to a hashmap and returning it to camunda run, but every time the select box in the form shows no entries.
I am using the delegate execution and returning like described in the docs.
I can’t find any Description of how to set the field in the modeler properly. This is what i tried:

Am i doing anything wrong? Pls help me.

[Niall]

Are you able to verify that the variable is being stored in the engine correctly?
Can you view it in cockpit?

[ThomasZ]

The Variable is stored in the Cockpit. I tried it with the code i send in my GitHub and also tried to make the square brackets on every side oft he Json, but still does not work, see in the Screenshots.