JSFiddle - React, Tailwind, and code Playground

HTML

<br /><br />
<fieldset>
    <legend style="border:3px solid red">
        Legend legend legend legend
        <span class="legendText">Aligned Text</span>
    </legend>
    text text text
</fieldset>

CSS

legend { position: relative; }
.legendText { 
    display: inline-block;
    position: absolute;
    width: 92px;
    top: -16px;
    right: -96px;
}