Is there a way to parameterize JSON objects?

Basically this is my JSON parameters file,


    "isApplyingFor": true,
    "state": "LA",

    "household": {
      "members": [
          "firstName": "John",
          "lastName": "Doe",
          "birthDate": "xxxx-xx-xx"
        "associations": {}

And here is my JSON ELfilebody

"id": "23",
"isApplyingFor": ${isApplyingFor},
"userId": "23",
"state": "${state}",
"year": 2015,
"household": ${household}


I want household as an object. But when I run it, it gives me a bad request. I think is because it takes the object but it doesnt put it as strings. Any way to fix this? Thanks in advance.