best practice: non-page range references in e.g. journal article citations

The journal article type in zotero provides for page numbering, but not some other reference mechanisms sometimes used in lieu of pages in some classics journals (e.g., columns, plates, etc.). What is best practice for capturing this information? "Extra"?

Example (from an un-page-numbered but colum-numbered journal):

C. Anti, “Esplorazioni archeologiche nella Licia e nella Panfilia,” MonAnt 29 (1923) cols. 657 786.
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