How to enable bluetooth web in chrome - in preparation for puck.js ?

I'm using Version 54.0.2840.99 m chrome on windows 10.

https://googlechrome.github.io/samples/w­eb-bluetooth/device-info.html

Requesting Bluetooth Device...
Argh! NotSupportedError: Web Bluetooth is not enabled on this platform. To find out how to enable it and the current implementation status visit https://goo.gl/HKa2If

this leads to here:
chrome://flags/#enable-web-bluetooth

Web Bluetooth Mac, Linux, Chrome OS, Android
Enables Web Bluetooth which could allow websites to connect to and control Bluetooth devices around you. [#enable](http://forum.espruino.com/sear­ch/?q=%23enable)-web-bluetooth
Sorry, this experiment is not available on your platform.
BLE Advertising in Chrome Apps Chrome OS
Enables BLE Advertising in Chrome Apps. BLE Advertising might interfere with regular use of Bluetooth Low Energy features. [#enable](http://forum.espruino.com/sear­ch/?q=%23enable)-ble-advertising-in-apps­
Sorry, this experiment is not available on your platform.

How do you enable?

Thanks