Reaching a document value in a Tag using expression

I have a UDT, inside it there is root R and inside it there are memory tags.
one of the memory tags has a value {document}. Inside {document} there is object which has another object that has some values that I want to access with expression:
[~]my folder/R/mytag → Value → 2nd object → first parameter

Does this help at all?

EDIT: I see now you’re looking for an expression solution, so that might not be exactly what you’re looking for, but it might help get you there…

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It helped a lot! Thank you!