Breakdance provides an API to add additional Dynamic Fields to the Dynamic Data Chooser.
Dynamic Data API documentation is available on GitHub.
The Dynamic Data Chooser is opened when the database icon is clicked for any field that supports Dynamic Data.
By default, Breakdance will show Dynamic Fields for for common WordPress data including post data, Custom Fields, and more. Breakdance also includes built-in integrations to add for the 3rd party plugins Advanced Custom Fields, Toolset, and Metabox.
To add additional Dynamic Fields to the Dynamic Data Chooser, use the Dynamic Data API.