How do I add a combined print and e-book record in Primo to an Aspire reading list?

When the print and e-book copies of a title are indexed together in the same record in Primo (i.e. the result looks as follows):

The Aspire bookmarklet will only add the e-book to Aspire. You will then be able to add the print book separately if you wish. (How do I do that?)

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