JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    Preferred flavor
    <div><input type="radio" name="flavorGroup" data-bind="checked: cherryOn" /> Cherry</div>
    <div><input type="radio" name="flavorGroup" data-bind="checked: almondOn" /> Almond</div>
    <div><input type="radio" name="flavorGroup" data-bind="checked: mgOn" /> Monosodium Glutamate</div>
</div>

JavaScript

var viewModel = {
        cherryOn: ko.observable(true);
        almondOn: ko.observable(false);
        mgOn: ko.observable(false);
    };
     
    ko.applyBindings(viewModel);