docs: def get_template_options(self, instance=None, test_message=None, **kwargs):
          """Returns a dictionary of message template options.
  
          Extend using `extra_template_options`.
          """
          protocol_name = django_apps.get_app_config("edc_protocol").protocol_name
          test_message = test_message or self.test_message
          template_options = dict(
              name=self.name,
              protocol_name=protocol_name,
              display_name=self.display_name,
              email_from=self.email_from,
              test_subject_line=(
                  self.email_test_subject_line if test_message else ""
              ).strip(),
              test_body_line=self.email_test_body_line if test_message else "",
              test_line=self.sms_test_line if test_message else "",
              message_datetime=get_utcnow(),
              message_reference="",
          )
          if "subject_identifier" not in template_options:
              try:
                  template_options.update(subject_identifier=instance.subject_identifier)
              except AttributeError:
                  pass
          if "site_name" not in template_options:
              try:
                  template_options.update(site_name=instance.site.name.title())
              except AttributeError:
                  pass
          return template_options