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You can retrieve the value of the last index in a nested array of objects in JavaScript by accessing the last element of the outermost array and then the last element of the inner array.

Here's an example code snippet that demonstrates this:

let data = [
  {
    id: 1,
    items: [
      {
        name: 'apple',
        quantity: 2
      },
      {
        name: 'banana',
        quantity: 3
      }
    ]
  },
  {
    id: 2,
    items: [
      {
        name: 'orange',
        quantity: 5
      },
      {
        name: 'grape',
        quantity: 1
      }
    ]
  }
];

let lastItem = data[data.length - 1].items[data[data.length - 1].items.length - 1];
console.log(lastItem); // prints { name: 'grape', quantity: 1 }

In this example, we have an array of objects data, where each object has an items property that is an array of objects. To retrieve the value of the last index in the items array of the last object in the data array, we use the data.length - 1 index to access the last object in the data array, and then use data[data.length - 1].items.length - 1 to access the last object in the items array of that object.