Schema Premium – WordPress Structured Data Plugin
Schema Premium is a WordPress plugin that has features to add schema.org structured data markup in JSON-LD format, which is most recommended by search engines such as Google.
Plugin site: https://schema.press/
Schema (markup) is a code (semantic dictionary) that you post on your website to help search engines return more informative results to users. Schema Premium allows you to implement the correct layout of structured schema.org data on your WordPress site.