JSFiddle - React, Tailwind, and code Playground

HTML

<table id="Report">
 <thead>
  <tr>
   <th>Kod</th>
   <th>Nazwa</th>
   <th>Ilość</th>
   <th>Netto / 1szt.</th>
   <th>Suma brutto</th>
  </tr>
 </thead>
<tbody>
 <tr>
  <td>00171 </td>
  <td>SŁUP 50/1800 POŚREDNI(P) </td>
  <td>5</td><td>97.00 PLN </td>
  <td>394.31 PLN </td>
 </tr>
 <tr>
  <td>00172</td>
  <td>SŁUP 50/1800 NAROŻNY(P)</td>
  <td>1</td><td>97.00 PLN</td>
  <td>78.86 PLN</td>
 </tr>
 <tr>
  <td>00173 </td>
  <td>SŁUP 50/1800 KOŃCOWY(P) </td>
  <td>1</td><td>97.00 PLN </td>
  <td>78.86 PLN</td>
 </tr>
</tbody>
<tfoot style="font-weight: bold;">    
 <tr>
  <th colspan="3" style="text-align: right;">Razem netto: 1955.85 PLN</th>
  <th colspan="2" style="text-align: right;">Razem brutto: 2405.69 PLN</th>
 </tr>
 </tfoot>
</table>

<br><br>
<div id="r"></div>

CSS

table td { padding: 5px; }
#r { padding: 5px; background: yellow; }

JavaScript

var sendData = [];

$('#Report tbody tr').each(function(i, el){
    var key = $.trim($(this).find('td:eq(0)').text()),
        val = $.trim($(this).find('td:eq(2)').text()),
        obj = {};
    obj[key] = val;
    sendData.push(obj);
});

$('#r').html(JSON.stringify(sendData));