Free Postage based on categories like other promotions

Is there a way to offer the Free Postage promotion based on the category? This is possible for other promotions but not for free postage. It doesn't seem to be an option.

I sell books and publications as well as stamps. So the free postage offer has a very different impact based on which the customer buys. If it could be limited to stamps via categories then I could offer it differently based on this impact. Otherwise, I guess I can't use the Free postage offer.
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