WooCommerce Customer/Order CSV Export - Add custom columns when using the legacy one row per item format

wc-customer-order-csv-export-modify-csv-format.php

<?php
/**
 *Additional columns for CSV Export
 */
function wc_csv_export_modify_column_headers( $column_headers ) {

	$new_headers = array(
		'column_1' => 'Column 1',
		'column_2' => 'Column 2',
		// add other column headers here in the format column_key => Column Name
	);

	return array_merge( $column_headers, $new_headers );
}
add_filter( 'wc_customer_order_csv_export_order_headers', 'wc_csv_export_modify_column_headers' );

// set the data for each for custom columns.  for orders with multiple items this will include the same data for each item
function wc_csv_export_modify_row_data( $order_data, $order ) {

	$custom_data = array(
		'column_1' => get_post_meta( $order->id, 'some_meta_key', true ),
		'column_2' => get_post_meta( $order->id, 'some_other_meta_key', true ),
		// add other row data here in the format column_key => data
	);

	$new_order_data = array();
	foreach ( $order_data as $data ) {
		$new_order_data[] = array_merge( $data, $custom_data );
	}

	return $new_order_data;
}
add_filter( 'wc_customer_order_csv_export_order_row', 'wc_csv_export_modify_row_data', 10, 2 );

How do you move where these columns show?