Hassio and local audio

mopidy is playing fine through my RPI audio jack, but I can’t figure out how to change the output devices. I can see my USB stick:

➜  / hassio host hardware
  "audio": {
    "0": {
      "name": "bcm2835 - bcm2835 ALSA",
      "type": "ALSA",
      "devices": {
        "0": "digital audio playback",
        "1": "digital audio playback"
      }
    },
    "1": {
      "name": "USB-Audio - USB PnP Sound Device",
      "type": "Device",
      "devices": {
        "0": "digital audio capture"
      }
    }
  }
}

And looking at the mpd.conf.example it seems like I should be able to set it in the options using (in the options panel in hass):

  "options": [
    {
      "name": "audio_output/type",
      "value": "alsa"
    },
    {
      "name": "audio_output/device",
      "value": "hw:0,1"
    }
  ]

Tried several things for the value of device and can’t get it to work.