I'm also thinking of storing the schema knowledge from the frontmatter but as this data is kind of advanced and can change from publish type to write-up sort (Posting, HowTo etc.) I am unsure if this is but a good idea? The admin could independently find the custom URL or https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-google-rich-snippets-json-ld-opengraph-twitter-tags-schemaorg.html