JSFiddle - React, Tailwind, and code Playground

HTML

<input type='checkbox' onclick='testDataProp(this)' data-tf="some value">
<input type='checkbox' onclick='testDataProp(this)'>

JavaScript

function testDataProp(clickedBox)
{
    var trueFalse=$(clickedBox).data('tf');
    alert(trueFalse);
}