JSFiddle - React, Tailwind, and code Playground

HTML

<h2>This</h2>
<h2>This is</h2>

JavaScript

$("h2").html(function(){
    var text= $(this).text().split(" ");
    var last = text.pop();
    return text.join(" ")+ (text.length > 0 ? " <span>"+ last + "</span>" : last);
});