Possible to import a custom field from .bib file?

I've been using Jabref for a long (long) time.
I am considering switching over to Zotero.

An absolutely crucial piece of data for me is the date when I added the reference.
I had Jabref set up so that the date added was stored in a field called "timestamp" in the .bib file.

Is there any way to import this .bib file to Zotero and preserve this field?
Ideally, it would overwrite Zotero's date added field.
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