ruuvitag GATT services

So, to change data on the notify characteristics of the UART service do I have to write something like that?

const serviceUUID = '6e400001b5a3f393e0a9e50e24dcca9e';
const characteristicUUID = '6e400003b5a3f393e0a9e50e24dcca9e';

NRF.updateServices({
    serviceUUID : {
      characteristicUUID : {
        value : 12345,
        notify : true
      }
    }
  });

And then, from the script on the laptop, I have to read the data value of the notify descriptor, isn't that right?