Question about Samsung HW-Q90R

The thing only has one output: HDMI. Connecting headphones via cable is therefore not possible. I have never tried Bluetooth - the instructions only mention that you can access streaming services via WiFi, but the product description says nothing about Spotify or the like, and for Spotify Connect, for example, you need your mobile phone. Somehow it also seems more logical to me that you connect the headphones to the TV or to the mobile phone, depending on where the audio comes from. I have the thing in the Wifi, but nothing appears on the TV that would indicate that the system can independently tap into any streaming sources - so BT Audio Output would also make no sense.