JSFiddle - React, Tailwind, and code Playground

HTML

<ol data-bind="foreach: list">
    <li data-bind="text: $data"></li>
</ol>

JavaScript

var model = {
    list: ko.observableArray([3, 5, 7])
};
    
ko.applyBindings(model);

setTimeout(function() {
    model.list()[1] = 55;
    model.list.push(99);
    model.list()[2] = 77;
}, 2000);