Gatsby can make relationships between nodes through "mappings". You need to refer to a file - yaml or json - which contains a list in the root.

This would be an example of a file that can be consumed by the Gatsby mapping:

- id: Kyle Mathews
  twitter: "@kylemathews"
- id: Mathew Kyles
  twitter: "@mathewkyles"

I have not found a way to have a root-level list in Netlify CMS. Am I correct that a list can only exist under an object? How can we achieve these mappings then?