Widget idea: BLE Battery Service

How would I use this example as a way use my bangle2 to advertising it as a beacon?
I have tried

(() => {
  function advertiseBeacon() {
    NRF.setAdvertising([
      require("ble_ibeacon").get({
        uuid : [0xb1, 0xae, 0x51, 0x2b, 0x97, 0x03, 0x4a, 0xe2, 0xb9, 0xc3, 0x9e, 0x26, 0x0c, 0xa7, 0xb3, 0x99],
        rssi : -60
      })
    ]);
  }
  setInterval(advertiseBeacon, 60 * 1000);
  advertiseBeacon();
})();

but get a "Uncaught Storage Updated" when I try to save it to a file in storage on the watch.

I want to figure out how to use it in this format

Bangle.bleAdvert[0x180F] = [E.getBattery()];

so they all play together
Thanks
Katherine