v1/vendor/chi-teck/drupal-code-generator/templates/hook/filetransfer_info.twig

/**
 * Implements hook_filetransfer_info().
 */
function {{ machine_name }}_filetransfer_info() {
  $info['sftp'] = [
    'title' => t('SFTP (Secure FTP)'),
    'class' => 'Drupal\Core\FileTransfer\SFTP',
    'weight' => 10,
  ];
  return $info;
}