Custom WCFM Field

Hi there,

I am using Woocommerce and WCFM Vendor Marketplace plugins and have added meta information to my items at the time of ordering like so:

add_action( 'woocommerce_checkout_create_order_line_item', 'wcfm_add_vendor_order_line_item_meta', 10, 4 );
function wcfm_add_vendor_order_line_item_meta( $item, $cart_item_key, $values, $order ) {
  $product = $values['data'];
  if ( $product ) {
    $product_id = $product->is_type( 'variation' ) ? $product->get_parent_id() : $product->get_id();
    $vendor_id = wcfm_get_vendor_id_by_post( $product_id );
    $vendor_address = wcfm_get_vendor_store_address_by_vendor( $vendor_id );
    if ( $vendor_id ) {
      $_wcfm_vendor_VAT_id = wcfm_get_user_meta( $vendor_id, 'wcfm_vendor_VAT_id', true );
      if ( ! empty( $vat_id ) ) {
          $item->update_meta_data( '_wcfm_vendor_vat_id', $_wcfm_vendor_VAT_id );
          $item->update_meta_data( '_wcfm_vendor_address', $vendor_address );
      }
    }
  }
}

add_filter( 'woocommerce_order_item_display_meta_key', function( $display_key, $meta = '' ) {
  if( $display_key == '_wcfm_vendor_vat_id' ) {
    $display_key = __( 'VAT ID' );
  }
  if( $display_key == '_wcfm_vendor_address' ) {
    $display_key = __( 'VENDOR ADDRESS' );
  }
  return $display_key;
}, 50, 2 );

The intentions of this code is to add address information (country, state) about WCFM vendors as well as their tax information (VAT). However I am not seeing it populate as any of the export options. Can you help me with this?