Save image from image picker with additional data

I’m trying to save a product that will contain multiple images, and each image needs to have a description. On the product addition page, the user can upload their images through a “multifile uploader.” Once the images are chosen, they are displayed in a repeating group where each image has a text input for adding a description.

When I click save, I want to save the product and then store all the images with their associated descriptions in a separate table, relating them to the product. However, I can’t figure out how to do this because the multifile uploader returns an image, and the repeating group must be of type image to display the selected images. I can’t find a way to access each image+description to save them separately one by one after saving the product.

Does anyone know if there is an official way or a workaround to achieve this?
Thank you very much.

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