Subscriptions in Woocommerce - Apply fees to reoccurring orders based on shipping method

I am trying to add fees on reoccurring subscriptions picked for delivery. I need to add 1.a service fee 2. the same delivery tip as the initial order

Can anyone help me? This is the code woo gives for reoccurring orders in subscriptions, but I do not know how to create it where it only adds the fees to the reoccurring order based on the shipping zone for delivery and not just every order. https://woocommerce.com/document/subscriptions/develop/recurring-cart-fees/

add_filter( 'woocommerce_cart_calculate_fees', 'add_recurring_postage_fees', 10, 1 );

function add_recurring_postage_fees( $cart ) {
    if ( ! empty( $cart->recurring_cart_key ) ) {
        $cart->add_fee( 'Postage', 5 );
    }
}