code: def get_placeholder_data(self, request, obj=None):
          
          # Return all placeholder fields in the model.
          if not hasattr(self.model, '_meta_placeholder_fields'):
              return []
  
          data = []
          for name, field in self.model._meta_placeholder_fields.items():
              assert isinstance(field, PlaceholderField)
              data.append(PlaceholderData(
                  slot=field.slot,
                  title=field.verbose_name.capitalize(),
                  fallback_language=None,  # Information cant' be known by "render_placeholder" in the template.
              ))
  
          return data
docs: Return the data of the placeholder fields.