How to search "publication" in Zotero LookUp engine?

I want to search the "publication" filed of journal article, for example to search the basic information (e.g. zone, IF...) of journal "Nature".

So i plan to modify the "engines.json" file, but i don't know the code for "publication".

We all know the code for "title" is {z:title}, so anybody knows the code for "publication"?

Thanks.
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