JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" /><label id="one"> Some Number (XXXXXX1234)</label><br />
<input type="checkbox" /><label> Some Other Number (XXXXXX4567)</label><br />
<input type="checkbox" /><label> Some Number (XXXXXX7890)</label>

CSS

span {
    color: red;
}

JavaScript

$(#one).html(function(_,html) {
    return html.replace(/(\(.*?\))/, "<span>*</span>");
});