JSFiddle - React, Tailwind, and code Playground

HTML

<div data-bind="foreach:list">
    <label> 
        <input type="radio" data-bind="
            checkedValue: {
                data: $data,
                index: $index(),
            },
            checked: $parent.checkedVal
        "/>
        <span data-bind="text: $data"></span>
    </label>
    <br />
</div>
<span data-bind="text: JSON.stringify(checkedVal())"></span>

JavaScript

function viewModel() {
    this.list = [
          "One",
          "Three",
          "Five"
        ];
    this.checkedVal = ko.observable();
}

ko.applyBindings(new viewModel())