Mongoose Model for Nested Array JSON

I need to create a Mongoose model for the below nested JSON array. The issue I am facing is TLSM01 is a dynamic Key and I am unable to specify it in the model. If I mention entities alone and pass the all the json objects as string it is storing as [object] and not data.

 "entities": [
        {
          "TLSM01": [
            {
              "01": {
                "Name": "Light",
                "Properties": [
                  {
                    "state": [
                      {
                        "type": "boolean",
                        "propertyMode": "actuator"
                      }
                    ],
                    "brightness": [
                      {
                        "type": "integer",
                        "propertyMode": "actuator"
                      }
                    ]
                  }
                ]
              }
            }
          ]
        }

Mongoose Model:

var thingsSchema = ({
    "uuid": String,
    "things": String,
    "manufacturerName": String,
    "manufacturerId": String,
    "osName": String,
    "hardwareVersion": String,
    "firmwareVersion": String,
    "entity": [{String}]
})

via Karthikeyan Prakash