JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td>A</td>
        <td>B</td>
        <td>C</td>
        <td>D</td>
        <td>E</td>
        <td>F</td>
    </tr>
    <tr>
        <td>G</td>
        <td>H</td>
        <td>I</td>
        <td>J</td>
        <td>K</td>
        <td>L</td>
    </tr>
</table>

CSS

td {
    padding: 10px;
}

JavaScript

var cellIndexMapping = { 0: true, 1: true, 3:true, 4:true, 5:true},
    finalData = '';

$("table tr").each(function(rowIndex) {
    var data = [];
    $(this).find("td").each(function(cellIndex) {
        if (cellIndexMapping[cellIndex])
            data.push( $(this).text() );
    });
    
    finalData += data.join(', ') + "\n";
});

console.log(finalData);