Filter the rest api result when exporting orders, replacing the meta value by display_value, which stores the readable data.

filter-order-meta-for-rest-api.php

<?php

add_filter( "woocommerce_rest_prepare_shop_order_object", function( $response, $object, $request ) {
	foreach( $response->data['line_items'] as $ind => $item ) {
		foreach( $item['meta_data'] as $md_ind => $meta_data ) {
			// If the value contains order-configuration-details
			if ( strpos( $meta_data['value'], 'order-configuration-details' ) ) {
				// then replace the value by display_value
				$response->data['line_items'][$ind]['meta_data'][$md_ind]['value'] = $meta_data['display_value'];
			}
		}
	}

	return $response;
}, 20, 3 );

add_filter( 'woocommerce_api_order_response', function( $order_data, $order, $fields, $server ) {
	foreach( $order_data['line_items'] as $index => $item ) {
		$wc_order_item = $order->get_item( $item['id'] );
		if ( ! $wc_order_item || ! function_exists( 'mkl_pc' ) ) continue;
		mkl_pc()->frontend->order->maybe_override_formatted_meta_data( $item['meta'], $wc_order_item );

		foreach( $item['meta'] as $meta_index => $meta ) {
			if ( $meta->value && strpos( $meta->value, 'order-configuration-details' ) && property_exists( $meta, 'display_value' ) ) {
				$meta->value = $meta->display_value;
			}
		}
	}
	return $order_data;
}, 20, 4 );