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If I understand you correctly, you're looking to use substitution parameters to automatically populate the Descriptor of an attribute. Unfortunately this isn't possible as they're taken as string literals for element/attribute templates so you would end up with something like "%Element%" as a string for your descriptor, rather than the actual reference you're looking for.
It looks like in Vasanth's example he's using an analysis to write to a new child attribute, which looks like it the solution you were already able to come up with (since in your screenshot the child attribute is the output of an analysis).
I would recommend adding an enhancement request to UserVoice.
Yes, Robert, that's what I was looking for. Thank you very much!