Rich snippets do indirectly enhance Web optimization. Employing a structured knowledge markup over a website alone wouldn't Increase the likelihood of a greater ranking in search results. I are not able to combine info associated with exactly the same entity by merchandise ID when this info is written in microdata https://www.presta-addons-modules.com/en/opencart-seo-automatic-google-rich-snippets-json-ld-integration-opengraph-twitter-tags-schemaorg.html