I have an array whose data I retrieve via the map() method. How do I put the key in the id of the array record?

Here’s just the code:

const [Arr, setArr] = useState([{ id: null, value: "text" }]);

{Arr.map((item, i) => {
   {item.value}
})}

And I want to put i from the map() method into the id array Arr.

How do I do it? Thanks!