[Vuejs]-Need to change this object into this array of objects in VueJS

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I have a function that gets there.

function shuffle(arr) {
var a = [];
for (let i = 0; i < arr.length; i++) {
    if (a.some(o => o["main"] === arr[i]["Main"])) {
        let idx = a.findIndex(x => {
            return x['main'] == arr[i].Main;
        });
        let copy = arr[i].SubMenu;
        a[idx].submenu.push(copy)
    } else {
        let copy = arr[i]["SubMenu"]
        let obj = {
            main: arr[i]["Main"],
            submenu: [copy]
        }
        a.push(obj);
    }
}
return a;
}

This will work if you pass in the Main array

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