How to add the liquid file in app to shopify theme？

[wintonli883]

I am using Shopify cli to develop Shopify app. I found a liquid file in my theme app extension. As shown in the figure below.

This is the project address of my app：https://github.com/Shopify/product-reviews-sample-app 

How to add the liquid file in app to shopify theme？

And I installed an app called "judge me" in the Shopify app market. I found the liquid file of the app in the Shopify theme. The address of this plug-in is https://apps.shopify.com/judgeme .

What can I do to add the liquid file in my app to Shopify theme, just like the app "judge me".