Add an icon to any individual shipping method in WooCommerce checkout page.

functions.php

<?php

/*
* Compatible with CheckoutWC Lite and CheckoutWC premium version.
*
* Snippet: Add a custom icon to any shipping method one by one in WooCommerce.
* Full Explanation: Coming soon.
* Author: Obi Juan
* Author URI: https://obijuan.dev
* License: GPL V2 or later.
*/

add_filter( 'woocommerce_cart_shipping_method_full_label', 'filter_woocommerce_cart_shipping_method_full_label', 10, 2 ); 

function filter_woocommerce_cart_shipping_method_full_label( $label, $method ) { 
   // Use the condition here with $method to apply the image to a specific method.      
	
	switch($method->method_id){
		case 'free_shipping':
			$label = $label . '<img src="https://www.bcwsupplies.com/pub/media/images/free_shipping/Free_Shipping_RTL_2020.png" width="10%">';
			break;
		case 'flat_rate':
			$label = $label . '<span>Icon</span>';
			break;
	}
	
	
   return $label; 
}