You can add this item with Inline Shortcode:
Default code:
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td></td>
<td></td>
</tr>
<tr>
<td></td>
<td></td>
</tr>
</tbody>
</table>
Example of this shortcode below:
<table>
<thead>
<tr>
<th>Employee</th>
<th>Salary</th>
<th>Bonus</th>
<th>Supervisor</th>
</tr>
</thead>
<tbody>
<tr>
<td>Stephen C. Cox</td>
<td>$300</td>
<td>$50</td>
<td>Bob</td>
</tr>
<tr>
<td>Josephin Tan</td>
<td>$150</td>
<td>-</td>
<td>Annie</td>
</tr>
<tr>
<td>Joyce Ming</td>
<td>$200</td>
<td>$35</td>
<td>Andy</td>
</tr>
<tr>
<td>James A. Pentel</td>
<td>$175</td>
<td>$25</td>
<td>Annie</td>
</tr>
</tbody>
</table>