Once the code is inserted and saved, refresh the GSDT to run the test again to ensure that the product schema and aggregateRating is showing up well. There should not be any errors present in the schema In cases where metafield is not present in a Shopify store (syndicated stores) A different set of rich snippet codes needs to be installed, which rely on pulling the review data from widget directly instead of the Shopify metafields:

Hopper IO Silicone Mouthpiece

Regular price $10.00
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Shipping calculated at checkout.

Hopper IO Silicone Mouthpiece

The silicone mouthpiece is a cone of food-grade silicone that slips over the front of your Grasshopper. It's designed to protect your lips during extended sessions and to be easily swappable if you are sharing with a group.