Workaround to enable a clickthrough URL to a shop with lighbox enabled on a gallery

I have a gallery page with photographs and want to have lightbox enabled so you can view the images at full size, but also provide a clickthrough url to the photograph on my shop page.

Lightboxes

Clickthrough URLs won't work in Image Blocks or Grid Gallery Blocks with Lightbox enabled. To add clickthrough URLs, uncheck Enable Lightbox or Lightbox.

If you want to keep lightboxes enabled and link images, we recommend adding a text link to the image's description. For Image Blocks, certain layouts also support buttons.

Thank you for the response, that helped me figure out how to add a text link in the image description with lightbox enabled on an image block, but is there a way to do the same thing with a gallery where you have a large number of pictures with a caption on each one?

@Zawn: You can use image metadata to pre-fill the title and description/caption that will be displayed in the lightbox, and the description can contain HTML links. There's an option in Settings that tells Squarespace to import metadata as you upload images, documented here. 

Here's an example of imported HTML links in a lightbox: https://www.whitprint.com/catalog/emerald-print-exchange-2020
(Note that not all of these images have links in the captions.) I pre-filled the HTML for these 145 images, then uploaded them en masse. (Actually, in batches, because I've had trouble with sqs choking on mass image uploads.)

You'll need to use your photo mgmt app (e.g., Photos on Mac) to get HTML text into the image metadata. Or you can use one of the many tools that can wrangle EXIF/IPTC data. (I used 'exiftool' -- very nice for us old-timers who know our way around a Unix command line -- and it has a CSV input/output option, which meant I could set up my data in a spreadsheet .)

That's perfect, thank you for the response and the help! Hopefully I will have the site up in not too long.