Many Shopify themes are returning structured data errors. This is a quick way to fix the errors and create manual product schema markup. It's probably on viable for stores with a few products as it is a manual fix.
There apps that can mitigate this but many are also limited in the schema they create.
I will be recording another video on using apps to deal with these issues in the future.
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https://optizenapp.com/
https://apps.shopify.com/seo-meta-tag