Given the following JSON...

```
{
  "values" : [
     "one",
     "two",
     "three"
  ]
}

```

... how do I transform it like this in Scala/Play?

```
{
  "values" : [
     { "elem": "one" },
     { "elem": "two" },
     { "elem": "three" }
  ]
}

```