Hass.io as Google home using bluetooth speaker?

I’ve got a RPI 3 set up running Hass.io, is there any way to connect it to a Bluetooth speaker to use as a Google Home style speaker? It’s a Bose Mini II Soundlink, so it’s got a decent microphone.

I’ve got the RPI connected directly to the router in the next room, so it’s easily within bluetooth range but there’s no way I can run any physical connection between them.

I’d be happy to buy a bluetooth transmitter if that’s required, but I don’t know if they can transmit the microphone audio back or if the jack on the RPI even supports a microphone.

Trying to achieve the same, but there seems no way of actually paring Hass.io to a bluetooth device.