wp_nav_menu()

 <!-- Cart Menu -->
            <?php 
              wp_nav_menu([
               'menu'            => 'Cart',
               'theme_location'  => 'Cart',
               'container'       => false,
               //'container_id'    => 'bs4navbar',
               //'container_class' => 'collapse navbar-collapse',
               'menu_id'         => false,
               'menu_class'      => 'navbar-nav mr-auto',
               'depth'           => 2,
               'fallback_cb'     => 'bs4navwalker::fallback',
               'walker'          => new bs4navwalker()
             ]);
            ?>
                    <!-- code for the badge START-->
            <?php $args = array(
              'menu' => 'Cart',
              'container' => '',
              'items_wrap' => '%3$s'
            ); ?>
            <ul class="badge">
            <?php wp_nav_menu($args); ?>
            <li>
              
              <?php
            if ( WC()->cart->get_cart_contents_count() !== 0 ) {
            // Do something fun
              ?>  
              <span class="badge-pill badge-warning no-md-view">
                <a class="cart-customlocation" href="<?php echo wc_get_cart_url(); ?>" title="<?php _e( 'View your shopping cart' ); ?>"><?php echo sprintf ( _n( '%d item', '%d items', WC()->cart->get_cart_contents_count() ), WC()->cart->get_cart_contents_count() ); ?></a>
              <?php 
            }
            ?>

            </span>

            </li>
            </ul>

Result

I want to add my PHP code to add a Bagde in my link using the wodpress menu admin.

I already add the code to the header (navbar), but I'd like to add it like a Badge in my cart icon.

Is anybody knows what happens?