How to use Theme app extensions if I'm using rails framework

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1

I’ve created a rails app and added shopify_app gem, now i want to do certain changes on product page. Thought of using ScriptTag and Asset API but docs states that “app might not pass App Store review if it uses script tags” and “exemption won’t be granted to apps that modify only a few pages( in case of Asset API)”.

Also, official docs only mentioned how to create extensions when working with node and not ruby. So, is there any option that we can have extensions for rails framework.

2

Stuck with the same problem app is built upon shopify_app gem, dont know how to create theme app extensions in rails.