JSON encoding in chicagoBoss

Question

I have created a table name 'drugs' in chicagoboss. Mnesia has been used. Schema of the table is:

id, generic_name, brand_name, description

One record of the table is:

{
    drugs,
    "drugs-3",
    "Generic name",
    ["Trade Name","AnotherTradeName"],
    "This is the description of the drug"
}

To print the data in json format the code I have used:

-module(appname_drug_controller, [Req]).
-compile(export_all).

get('GET',[])->
  ADrugs=boss_db:find("drugs-3"),
  {json, [{resposne,ADrugs}]}.

I supposed to get:

{
  "resposne": {
    "id": "drugs-3",
    "generic_name": "Generic name",
    "brand_name": [
      "Trade Name",
      "AnotherTradeName"
    ],
    "description": "This is the description of the drug"
  }
}

But I am getting:

{
  "resposne": {
    "id": "drugs-3",
    "generic_name": "Generic name",
    "brand_name": "Trade NameAnotherTradeName",
    "description": "This is the description of the drug"
  }
}

So instead of array brand_name is returned as a single line of string. How can I get the correct structure?