Edition field in renaming

I would like to add the edition of certain textbooks to their name.
So the file would look like this for example; "Author - title of the book, 4E (1998)"
I tried the following string {%a} - {%t}, {%edition"E"}({%y})" but can't seem to find the place holder for the Edition field.

Does anyone know what the place holder is for the edition field?
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