Transform object in js

I want transform a Javascript object to a different form. Lets take an example.

may be I have an object like this,

[
  {
    "_id": 1,
    "name": "abc",
    "sub": [
      "bbb",
      "ccc"
    ]
  },
  {
    "_id": 1,
    "name": "abc1",
    "sub": [
      "bbb1"
    ]
  },
  {
    "_id": 1,
    "name": "abc"
  }
]

and I want to transform that like below,

[
  {
    "_id": 1,
    "name": "abc",
    "sub": [
      {
        "sub": "bbb"
      },
      {
        "sub": "ccc"
      }
    ]
  },
  {
    "_id": 1,
    "name": "abc1",
    "sub": [
      {
        "sub": "bbb1"
      }
    ]
  },
  {
    "_id": 1,
    "name": "abc"
  }
]

can anyone please help me to solve this. Thanks.