getStringProperty method
Implementation
StringPropertyStream getStringProperty(String key) {
// For array indices like "[0]", don't add a dot separator
final fullPath = _propertyPath.isEmpty
? key
: (key.startsWith('[') ? '$_propertyPath$key' : '$_propertyPath.$key');
return _parserController.getPropertyStream(fullPath, String)
as StringPropertyStream;
}