ViewsUiTestFieldHooks.php

<?php

declare (strict_types=1);
namespace Drupal\views_ui_test_field\Hook;

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Hook\Attribute\Hook;

/**
 * Hook implementations for views_ui_test_field.
 */
class ViewsUiTestFieldHooks {
    
    /**
     * Implements hook_form_FORM_ID_alter() for views_ui_add_handler_form.
     *
     * Changes the label for one of the tests fields to validate this label is not
     * searched on.
     */
    public function formViewsUiAddHandlerFormAlter(&$form, FormStateInterface $form_state) : void {
        $form['options']['name']['#options']['views.views_test_field_1']['title']['data']['#title'] .= ' FIELD_1_LABEL';
    }

}