JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td aria-label="col1"></td>
        <td>line1</td>
    </tr>
    <tr>
        <td aria-label="col1"></td>
        <td>line2</td>
    </tr>
    <tr>
        <td aria-label="col1"></td>
        <td>line3</td>
    </tr>
    <tr>
        <td aria-label="col1"></td>
        <td>line4</td>
    </tr>
    <tr>
        <td aria-label="col1"></td>
        <td>line5</td>
    </tr>
    <tr>
        <td aria-label="col1"></td>
        <td>line6</td>
    </tr>
    <tr>
        <td aria-label="col1"></td>
        <td>line7</td>
    </tr>
</table>

CSS

td:first-child:after {
    content: attr(aria-label);
}