Collection-specific item fields

I want to use Zotero collections to mirror reading lists for my classes, but I've found it hard to order the readings arbitrarily.

I can use the Extra field in some cases, but when multiple courses all refer to the same text, Extra becomes useless.

Is it possible to create collection-specific item fields (if necessary, I'm happy to code a plugin), or else otherwise arbitrarily order items in a collection?
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