Repository tag filled with unAPI

We would like to change the content of the tag "Repository", which is now filled with "unAPI" when we saved bibliographic records from our Library catalog RERO.
How to do to fill this tag with "RERO Library Catalog", for example?

Does Zotero use a MARC tag in order to find this information?

Thanks for your help!
Raphaëlle Vuadens
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