How to get rumble working - Nvidia Shield TV (with SteamLink app or Moonlight) + XBox One controller streaming from PC

Hi,

I'm using the paid verion of the Android server on the Nvidia Shield TV (fully updated) streaming from my PC through either the SteamLink or Moonlight apps installed on the Shield. I'm using an Xbox One controller which I usualy connect using the Shield's bluetooth connection (the controller's bluetooth USB dongle doesnt seem to pair to the controller when connected to the Shield).

The controller seems to work OK (controls/buttons work well), however, there is no rumble effect present at all, using either SteamLink app or Moonlight. Can anyone shed any light on how to get it working?

Thanks in advance