For custom settings please modify menuItems array. For example using xhr request:
let menuItems = null;
let xhr = new XMLHttpRequest();
xhr.withCredentials = true;
xhr.addEventListener("readystatechange", function () {
if (this.readyState === 4) {
menuItems = JSON.parse(this.responseText);
}
});
xhr.open("GET", "https://reqres.in/api/users?page=1");