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No, right now there is no way to do this. Not the visible images a relevant, but the link. All links which link to an image will be used, even if there is no visible image at all (also see https://wordpress-demo.arnowelzel.de/lightbox-with-photoswipe-external-images/ with an example). But for future updates I may add some property like data-lbwps-ignore what can be added to the link so it will not be used.