Look through by way of some search results in your niche and Check out what your competitors are doing. Using the Custom Schema solution, you'll be able to develop a custom Schema, fill during the Schema, and include it to the page. Or, you may produce a blank Schema structure https://www.presta-addons-modules.com/en/opencart-seo-automatic-google-rich-snippets-json-ld-integration-opengraph-twitter-tags-schemaorg.html