I know that you can refer to the value of any identifier inside of a case if you have an index/element parameter for that case.
An example of this is used in the FlowShop problem for comparing cases:

I know this feature has existed for quite some time already. However, I am trying to access the value of an identifier inside of a case, but the identifier is part of a module (so it has a prefix). In the above example, suppose that I have the p_GCJobStart inside of a module with the prefix custom_prefix, in theory this should then be:

However, this does not work.
Is there any way that I can use this construct to get the value of the identifier inside the case without explicitly copying it?