This attribute comes in clutch for pages that function the default Edition for customers whose language or area doesn’t match any hreflang tags.  You can use Ahrefs to solve this issue – just go to the list of pages that link to your URL in the hreflang annotations and click https://addons.prestashop.com/it/seo-indicizzazione-naturale/31857-google-rich-snippet-automatico-json-ld-open-graph-seo.html