how to fetch a value from specific index of object property that has the values of pushed array in javascript

i am trying to get a value from specific index of object property. i have used push function to push the value to object property. but when i call result.marks[0], it return all the values in array.

<html>

    <body>
        <p id="demo"></p>
        <script>
        try {
            let result = {
                marks: [], // 
            };
            const n = 5;
            let text = "";
            for (let i = 0; i < n; i++) {
                text += prompt("Enter value of " + i, i) + "<br>";
            }
            result.marks.push(text);
            document.getElementById("demo").innerHTML = result.marks[0]; // it does not print the specific index value. it prints all the values
        }
        catch (err) {
            document.write(err);
        };
    </script>
</body>

</html>