thumbnail at selected product page using public app

Shopify Partner
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I am developing a public app for my client. Client needs to show a thumbnail/image at the product page by selecting a product from the public app. I have checked many apps are updating product. i.e showing sale countdown or adding field at the selected product.

Anyone can share way to achieve this functionality? how can I show thumbnail/image on the selected product using scriptTags or any solution/suggestion that works for me?



Kind regards,

Muhammad Asfar