/**
 * Implements hook_tokens_alter().
 */
function {{ machine_name }}_tokens_alter(array &$replacements, array $context, \Drupal\Core\Render\BubbleableMetadata $bubbleable_metadata) {
  if ($context['type'] == 'node' && !empty($context['data']['node'])) {
    $node = $context['data']['node'];

    // Alter the [node:title] token, and replace it with the rendered content
    // of a field (field_title).
    if (isset($context['tokens']['title'])) {
      $title = $node->field_title->view('default');
      $replacements[$context['tokens']['title']] = \Drupal::service('renderer')->render($title);
    }
  }
}
