Updating existing item details using site translator

I am currently migrating from Reference Manager to Zotero, and exporting all the existing bibliographic information is not a problem. However, most of these reference do not have "modern" fields, like URL or DOI. For most (if not all) of them OpenURL will lead to the current webpage of the paper. So is there any way to use site translator to fill empty fields in the existing item _instead_ of creating a new one? It will be even better if the whole workflow can be automated to update fields in many (or all) items in the database with a single click (by automatic crawling through OpenURLs) . This update may also include downloading PDF files, where available, since it may be faster than manually assign existing files.
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