Checking two variables for equality in Zotero 3.0

Dear community,

Is it possible in Zotero 3.0 to check, if the value of the variable "container-author" is equal to the value of the variable "author"? I would like to implement an argument that has the following logical form:

IF variable="container-author" EQUALS variable="author" THEN ...

Best,
Markus

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