const fakeDataObj = fakeData2.reduce((obj, item) => Object.assign(obj, { [item.name]: item.valueOf() }), {}) 

const str = '4556' as string;

console.log(fakeDataObj['4556' as keyof typeof fakeDataObj]);

//back to array
const new array = []
 for (const elem in fakeDataObj.data) {
                newArray.push(fakeDataObj.data[elem as keyof typeof fakeDataObj.data])
            }