Need to create a single JSON response from multiple input Objects

Question

I am creating a middleware orchestration service, where I am calling a bunch of endpoints to get data from the backend database and have all those individual responses as JSON.

I need to create one single JSON output for my front-end application. Below are the three separate JSON responses from my backend and the output which I need to feed into the web application.

How can I transform the output to the required JSON?

JSON-1

[
    {
        "cartFriendlyName": "Morelia spilotes variegata",
        "cartIsActive": true,
        "cartMFCCode": "NAP01",
        "cartZipCode": 60540,
        "cartID": "NAP01-55"
    },
    {
        "cartFriendlyName": "Geococcyx californianus",
        "cartIsActive": true,
        "cartMFCCode": "NAP01",
        "cartZipCode": 60540,
        "cartID": "NAP01-93"
    }
]

JSON-2

[
    {
        "itemID": 1,
        "qtyOnHand": 20,
        "cartID": "NAP01-55"
    },
    {
        "itemID": 4,
        "qtyOnHand": 10,
        "cartID": "NAP01-55"
    }
]

JSON-3

[
    {
        "itemID": 1,
        "qtyOnHand": 18,
        "cartID": "NAP01-93"
    },
    {
        "itemID": 3,
        "qtyOnHand": 50,
        "cartID": "NAP01-93"
    }
]

How Can I get my output JSON as the following?

{
  "data": [
    {
      "cartID": "NAP01-55",
      "cartInfo": {
        "cartFriendlyName": "Morelia spilotes variegata",
        "cartZipCode": 60540
      },
      "cartItems": [
        {
          "itemID": 1,
          "qtyOnHand": 20
        },
        {
          "itemID": 4,
          "qtyOnHand": 10
        }
      ]
    },
    {
      "cartID": "NAP01-93",
      "cartInfo": {
        "cartFriendlyName": "Geococcyx californianus",
        "cartZipCode": 60540
      },
      "cartItems": [
        {
          "itemID": 1,
          "qtyOnHand": 18
        },
        {
          "itemID": 3,
          "qtyOnHand": 50
        }
      ]
    }
  ]
}