Replace dot by comma in fee column

Hi! I love your plugin, congrats! My english is too bad, sorry! Im charging an extra fee in some orders according with this post:

https://docs.woocommerce.com/document/add-a-surcharge-to-cart-and-checkout-uses-fees-api/

/**
 * Add a 1% surcharge to your cart / checkout
 * change the $percentage to set the surcharge to a value to suit
 */
add_action( 'woocommerce_cart_calculate_fees','woocommerce_custom_surcharge' );
function woocommerce_custom_surcharge() {
  global $woocommerce;

	if ( is_admin() && ! defined( 'DOING_AJAX' ) )
		return;

	$percentage = 0.01;
	$surcharge = ( $woocommerce->cart->cart_contents_total + $woocommerce->cart->shipping_total ) * $percentage;	
	$woocommerce->cart->add_fee( 'Surcharge', $surcharge, true, '' );

}

When I’m export that field I’m receiving value but in dot decimal format. Im tried to change by a comma with this two ways:

https://ww.wp.xz.cn/support/topic/string-replace-2/

add_filter( 'woe_format_numbers', function($new_value, $value) {
  return number_format( floatval( $value ), 2, ".","" );
},10,2);

https://ww.wp.xz.cn/support/topic/replace-the-dot-with-a-comma/

add_filter('woe_get_order_value_fee_deeb1249643c4cee63e00ef8084468e2', function ($value, $order, $fieldname) {
	return str_replace( ".", ",", $value);
}, 10, 3);

I’ve replaced total_weight_items by fee_deeb1249643c4cee63e00ef8084468e2 because is the field title, but not working. Any help please? Thanks in advance!