How to create a complex dynamic modal?

Question

css

There are several products on the site, for each product there is a “sort of its own modal”, but there is only one, the modal has an image slider and information, I have an idea how to display the information, but the photos in the slider are a little difficult, given that the number -the photos are different everywhere, where to store them? I tried in JSON, but I can't decode it via JSON.parse(), maybe I'm stupid, please tell me if it's not difficult. Thank you.
I do this, when I click on the "details" button for a product, I take its id from the data-modal and make a request to the JSON file. Am I doing the right thing? And what is the error in JSON? Doesn't want to decode.
dveri.commeta.pro/modals.json

Answer 1

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I think you'll understand with pictures.