Any Field Image incl. Slideshow & Simple Gallery with URL option

Hello -- I'm not finding a way to add an url to a photo from any field plugin.
Let say, I want to create a project structure using zero app (think: project portfolio) where one section is to list project sponsors -- images that link to the sponsor's website. If I attempt to create or customize Single Post Layout, then every image field I try will allow me to select images, but there is no option to add link... On the other hand, if I'd have a library item (sponsor slideshow) I can't add it when populating the post (the library item is grey out / not accessible) - alternatively, if I would want to add slideshow to the single post layout, this will appear the same for every post, which is not the intended outcome. Please advise - thank you!!

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