OS 2 Theme: Add App Block on Collection page

Shopify Partner
15 0 1
I'm an app developer (it is a review app). For OS 2 themes, I wonder how can I add the star rating widget to the collection page? Basically, for the product page, we successfully add an App Block into the product.json file. However, I'm not sure how we can do the same for the collection page? Any thought would be appreciated.
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