Rich snippets are shown inside the search results, while structured details is embedded while in the HTML code of the webpage and is barely visible to engines like google. I've a website where I'm applying JSON-LD scripts to include structured knowledge. In on the list of scripts, I'm specifying impression https://addons.prestashop.com/pl/seo-pozycjonowanie-naturalne/31857-automatyczne-google-rich-snippets-json-ld-opengraph-seo.html