Complete tutorial : https://help.sinric.pro/pages/tutorials/custom-device-types/alcohol-sensor/MQ-3.html

MQ-3.json

{
  "name": "Gas Sensor",
  "description": "Gas Sensor",
  "deviceTypeId": "654d7ef928f14e9ac82ad57d",
  "capabilities": [
    {
      "id": "5ff0b41b994fd31b7d5e8961",
      "mode": {
        "instanceId": "modeInstance1",
        "locale": "en-US",
        "modeName": "Alcohol",
        "nonControllable": true,
        "modeValues": [
          "Detected",
          "Not-Detected"
        ]
      }
    },
    {
      "id": "62a707bd9e2f39090569e2d3"
    }
  ]
}