Shopify App Development Product Detail Page

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I am developing an APP, it works like we can add a campaign (like the product but with some custom fields) from the APP and it will be pushed to Shopify's products.

Now my issue is, I want to modify the product detail page of the theme using my APP and display the information as per the custom fields which are added from the campaign, as this APP can be installed by anyone from the Shopify APP store, so we can not modify everyone's theme file. 

I need a solution or some workaround if there is any?

Thank You