Create a JSON without a key

We wanted to create a JSON structure as below in Java

{
 [
  { 
   "key": "ABC001",
   "value": true 
  },
  { 
   "key": "ABD12",
   "value": false 
  },
  { 
   "key": "ABC002",
   "value": true 
  },
 ]
}

To implement this we created a class and had a list private property inside it. But that is creating a key values

class Response{
private List<Property> values;
 // setter getter for this private property
}

The output for this is

{
values : [
{
"key": "ABC001",
"value": true
},
......
]

Is there a way we create the array without the key and inside the { }?