Google supports around seven Schema.org entity types (https://developers.google.com/search/docs/guides/mark-up-content https://developers.google.com/search/docs

Google supports around seven Schema.org entity types (https://developers.google.com/search/docs/guides/mark-up-content https://developers.google.com/search/docs/guides/mark-up-con...). I think they look at the user segments and people looking for APIs is not their main audience. Especially nowadays when AI and data science is much cooler than just software engineering ;-)