Root model instrospection schema shape.
Borrowed from: https://github.com/aws-amplify/samsara-cli/pull/377/commits/c08ea2c1a43f36aafe63b6d14d03f884e9c0c671#diff-21ae6faa2f22c15bb25ff9b272eaab7846c0650e2d267ab720546c19559583d0R4-R108
Optional
Root model instrospection schema shape.
Borrowed from: https://github.com/aws-amplify/samsara-cli/pull/377/commits/c08ea2c1a43f36aafe63b6d14d03f884e9c0c671#diff-21ae6faa2f22c15bb25ff9b272eaab7846c0650e2d267ab720546c19559583d0R4-R108