When I test the LDJSON of my products in Google Data Structure Tool, I get to many errors and warning in isRelatedTo and in isSimilarTo.
Seems that is missing to many attibutes (sku, image, descriotion, …)
You can check youself here
Also, I use the plugin Product GTIN to set the GTIN code in my products, but I can’t see the GTIN attributes on my Rich Snippets LDJSON.
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