The Post Schema form needs to be used on all posts on your website, so we propose placing it up since the default Schema kind. Once we confirmed you the way to produce a Schema with the new Rank Math, we also showed you ways to save a Schema as https://www.presta-addons-modules.com/en/opencart-seo-automatic-google-rich-snippets-json-ld-integration-opengraph-twitter-tags-schemaorg.html