docs: def update_form_labels(self, request=None, obj=None, form=None):
          """Returns a form obj after modifying form labels
          referred to in custom_form_labels.
          """
          for form_label in self.custom_form_labels:
              if form_label.field in form.base_fields:
                  label = form_label.get_form_label(
                      request=request, obj=obj, model=self.model, form=form
                  )
                  if label:
                      form.base_fields[form_label.field].label = mark_safe(label)
          return form