Programmatically customize a data column in the output of the plugin Advanced Order Export For WooCommerce.
add_filter( 'woe_fetch_order_row', function( $row, $order_id ) {
if( isset( $row['_custom_field'] ) ) {
$row['_custom_field'] = sprintf( '(Meta: %s)', $row['_custom_field'] );
}
return $row;
}, 10, 2 );