RRT identifies which rich end result types are supported for delivered URLs or code samples and shows any problems requiring consideration. I wouldn’t give Considerably body weight for their suggestion. They say that "Structured data markup is most very easily represented in JSON-LD format", but I believe it’s Harmless to https://addons.prestashop.com/pl/seo-pozycjonowanie-naturalne/31857-automatyczne-google-rich-snippets-json-ld-opengraph-seo.html