WooCommerce how to add extra fee for cash on delivery payment method

Add a shipping method called Cash on Delivery Shipping Method (for example), go to

WooCommerce > Shipping > Shipping zones > Italia ( or another country ) > edit > Add shipping method

in this case with a flat rate of 12,2 net that with 22% VAT become € 14.88

then go to WooCommerce > Settings > Payments > Cash on delivery

click Manage and go to Enable for shipping methods

add the just created method Cash on Delivery Shipping Method

Only if the cash on delivery payment is selected, the cash on delivery shipping method appears and so the extra fee is activated, WITH NO need to activate plugins external to WooCommerce