Testing for presence of journal abbreviation?

I think I am probably missing something really obvious...

I am trying to code a style for a French editor who wants journal titles in italics (easy), BUT
- a prefix "dans" if the full title of the journal is used
- no prefix if an abbreviation is used

I can output the journal abbreviation the way I need it with <text variable="container-title" form="short" font-style="italic"/>

but how do I go about testing whether there is an abbreviation in the Zotero data?

Journal abbreviations don't have CSL field names if I understand this document correctly http://gsl-nagoya-u.net/http/pub/csl-fields/journalArticle.html and this doesn't work either:
<if variable="container-title" form="short" match="any">

How is it done?
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