How to get the value of a column from a subpanel using a SQL query?

I have created a custom module and related it to contacts. This custom module appears as a contacts subpanel. I must also modify the columns of the subpanel. For this I have created the file

public/legacy/custom/modules/<custom_module>/metadata/subpanels/default.php

Content

<?php

if (!defined('sugarEntry') || !sugarEntry) {
     die('Not A Valid Entry Point');
}

$subpanel_layout = [
     'list_fields' => [
         'field_a' => array(
             'vname' => 'LBL_FIELD_A_C',
             'widget_class' => 'SubPanelDetailViewLink',
             'module' => 'Contacts',
             'width' => '25%',
         ),
         'field_b' => array(
             'vname' => 'LBL_FIELD_B_C',
             'widget_class' => 'SubPanelDetailViewLink',
             'module' => 'Contacts',
             'width' => '25%',
         ),
         'date_sent_c' => array(
             'vname' => 'LBL_DATE_SENT_C',
             'widget_class' => 'SubPanelDetailViewLink',
             'module' => 'Contacts',
             'width' => '25%',
         ),
     ]
];
``

This is going well. But I must show data obtained from a SQL query in a new column. Is it possible to do it this way?

Thanks for your suggestions

Does this help?