How to export addendum field

I'm using Zotero 7 and am exporting with Better BibTeX (both BibTeX and Better BibLaTeX give similar results).

I have a citation that I want to add an addendum to, but when I add the following to Extra

addendum: test

it exports as

annotation = {addendum: test}

rather than

addendum = {test}

Is there a way to fix this without editing the .bib file manually?
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