Adding custom field on 'whmcs/clientarea.php?action=services'?

[0xB0BACAFE]

Hello, I'm trying to add one custom field in my 'whmcs/clientarea.php?action=services' area, but after some tests, no progress.

        <tbody>
            {foreach key=num item=service from=$services}
                <tr onclick="clickableSafeRedirect(event, 'clientarea.php?action=productdetails&amp;id={$service.id}', false)">
                    <td class="text-center"><i class="fa fa-cube fa-2x" aria-hidden="true"></i></td>
                    <td><strong>{$service.product}</strong>{if $service.domain}<br />{$service.domain}</a>{/if}</td>

                    # Here where I'm trying to add the custom field.
					<td class="text-center">{$client_custom_field_customertype}</td>
                    
					<td class="text-center"><span class="label status status-{$service.status|strtolower}">{$service.statustext}</span></td>
                    <td class="responsive-edit-button" style="display: none;">
                        <a href="clientarea.php?action=productdetails&amp;id={$service.id}" class="btn btn-block btn-info">
                            {$LANG.manageproduct}
                        </a>
                    </td>
                </tr>
            {/foreach}
        </tbody>

Basically, using '{debug}' parameter, I noticed that variable don't come to this page, and don't have idea how I can import this.

The custom field that I need is to add the IP Address of a specific VPS instance.

Anyone had done that or know some form?

Thank you at all.