toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (chartId != null) 'chartId': chartId!,
if (elementProperties != null) 'elementProperties': elementProperties!,
if (linkingMode != null) 'linkingMode': linkingMode!,
if (objectId != null) 'objectId': objectId!,
if (spreadsheetId != null) 'spreadsheetId': spreadsheetId!,
};