Current state, only one link/redirect URL can be used per product utilizing dynamic product feed.
A client raised that it would be ideal to allow for 2+, the reason being to allow for an "add to cart" (if leveraging an ecom integration) or "buy now" (if they're using price spider) to drive conversion for that particular product, AND include a button "learn more" that drives to the PDP if a consumer isn't ready to purchase.