Product Assembly / Gift Wrap / ... Cost for WooCommerce product_assembly_cart_data filter example

product_assembly_cart_data.php

<?php
add_filter( 'product_assembly_cart_data', function( $data, $service_name, $cost_display, $cost_multiply, $item_data, $cart_item ) {
	$data['name']    = $service_name.' and some more text';
	$data['value']   = 'The cost'.( $cost_multiply ? ' per item ' : ' ' ).' is '.wc_price( $cost_display );
	$data['display'] = $data['value']; // We just show the same as value
	return $data;
}, 10, 6 );