Can I add custom Schema properties to the JSON-LD?

The Document SSO metabox allows you to customize several Schema property values based on the Schema type you choose, but if you need to include additional Schema properties, you can use the [schema] shortcode to manage the value of each Schema property individually.

For every Schema property you modify using the [schema] shortcode, remember to submit the webpage URL to the Google Structured Data Testing Tool to validate your markup.