Algol Plus Ltd

You should add  new field to export.

Follow to this topic https://algolplus.freshdesk.com/support/solutions/articles/25000016635-add-calculated-field-for-order-

Use meta key german_invoice_numbers and add this code to "Misc Settings".

add_filter('woe_get_order_value_german_invoice_numbers', function ($value,$order, $field) {
  $invoices = wc_gzdp_get_invoices_by_order( $order );
  if( $invoices ) {
    $numbers = array();
    foreach ( $invoices as $id => $invoice ) {
      $numbers[] = $invoice->get_title();
    }
   $value = join(", ", $numbers);
  }
  return $value;
}, 10, 3);