How to create a Custom Views Pseudo Field on Drupal

<?php

namespace Drupal\my_module\Hook;

use Drupal\Core\Hook\Attribute\Hook;
use Drupal\Core\StringTranslation\StringTranslationTrait;

/**
 * Hook Views Data implementations.
 */
#[Hook('views_data_alter')]
final class ViewsData {

  use StringTranslationTrait;

  /**
   * Implements hook_views_data_alter().
   *
   * Registers the my_module_node_original_title field on the node_field_data
   * base table so it is available in any View that uses Content as its base.
   */
  public function __invoke(array &$data): void {
    $data['node_field_data']['my_module_node_original_title'] = [
      'title' => $this->t('Title (original language)'),
      'help'  => $this->t('The node title rendered in its original (source) language, regardless of the current interface language.'),
      'field' => [
        'id' => 'my_module_node_original_title',
      ],
    ];
  }
}

<?php

namespace Drupal\my_module\Plugin\views\field;

use Drupal\node\NodeInterface;
use Drupal\views\Attribute\ViewsField;
use Drupal\views\Plugin\views\field\FieldPluginBase;
use Drupal\views\ResultRow;

/**
 * A Views field that always renders the node title in its original language.
 *
 * Useful when Views is displaying a translated context but the original
 * (source) language title is needed regardless of the current UI language.
 */
#[ViewsField('my_module_node_original_title')]
final class NodeOriginalTitle extends FieldPluginBase {

  /**
   * {@inheritdoc}
   */
  #[\Override]
  public function query(): void {
    // No extra query needed - the title is fetched from the loaded entity.
  }

  /**
   * {@inheritdoc}
   */
  #[\Override]
  public function render(ResultRow $values): string {
    $entity = $this->getEntity($values);

    if (!$entity instanceof NodeInterface) {
      return '';
    }

    return $entity->getUntranslated()->getTitle() ?? '';
  }

  /**
   * {@inheritdoc}
   */
  #[\Override]
  public function usesGroupBy(): bool {
    return FALSE;
  }

}

web/modules/custom/my_module/
├── my_module.info.yml                       # updated: added drupal:views dependency
└── src/
    ├── Hook/
    │   └── ViewsData.php                    # new: hook_views_data_alter() implementation
    └── Plugin/
        └── views/
            └── field/
                └── NodeOriginalTitle.php    # new: Views field plugin