I'd say they produce other indicates to establish if the information you supply via JSON-LD is appropriate to their online search engine (like checking your web page is in fact referring to what it claims to mention). Google won't promise that your structured details will exhibit up in search results, https://addons.prestashop.com/en/seo-natural-search-engine-optimization/31857-automatic-google-rich-snippets-json-ld-open-graph-seo.html