code: async def send_notification(self, title, message):
          
          query = gql(
              """
          mutation{
            sendPushNotification(input: {
              title: "%s",
              message: "%s",
            }){
              successful
              pushedToNumberOfDevices
            }
          }
          """
              % (title, message)
          )
  
          res = await self.execute(query)
          if not res:
              return False
          noti = res.get("sendPushNotification", {})
          successful = noti.get("successful", False)
          pushed_to_number_of_devices = noti.get("pushedToNumberOfDevices", 0)
          _LOGGER.debug(
              "send_notification: status %s, send to %s devices",
              successful,
              pushed_to_number_of_devices,
          )
          return successful
docs: Send notification.