IIIF images in lightbox or gallery?

When I add a media with a IIIf URL (no IIIF plugin installed) and then link it to an item. It does not appear in the lightbox gallery as media uploaded directly.

Is it possible to include a preview of a the iiif image in the lightbox in the linghtbox gallery?
In alternative
Is it to have a gallery with a preview of IIIf images ?

Thanks for your answers.