docs: def to_python(self, value):
          """
          Convert the input JSON value into python structures, raises
          django.core.exceptions.ValidationError if the data can't be converted.
          """
          if isinstance(value, dict):
              return value
  
          if self.blank and not value:
              return None
  
          if isinstance(value, string_types):
              try:
                  return json.loads(value)
              except Exception as e:
                  raise ValidationError(str(e))
  
          return value