How do you add type-property schemas from Schema.org into 8 sites?
Yes, there's a Drupal 7 module of the same name, schema.org.


  This project is a drop-in solution to enable the collections of
  schemas available at schema.org on your Drupal 7 site. The major
  search engines including Bing, Google and Yahoo! have agreed to
  recognized these in order to improve the display of search results.


Along with the core module, there's a UI that makes it pretty easy to setup; you specify the schema.org type on the content type settings page &amp; then you specify the schema.org property names on the field settings page. It also has support for address field &amp; fivestar fields.

In Drupal 8, the project has deferred to the RDFUI project, to provide the UI component, now that other parts of the module have been ported to core.


  The default RDF mappings of Drupal core have been updated to include
  schema.org in Drupal 8. Also, a lot of the backend code of this module
  was ported into Drupal 8 core. The User Interface allowing to set the
  mappings lives in the RDF UI, which is based on Sachini's Google
  Summer of Code project.