I created a public bool that returns if the order qualifies for free shipping or not. Is there any way to get that value (true or false) from the AspDotNetStorefrontCore.ShoppingCart.cs for use in an xml package?

Code:
        public bool OrderIsFreeShipping()
        {
                    decimal dSubTotal = SubTotal(true, false, true, true, true, true);
                    if (dSubTotal >= FreeShippingThreshold)
                    {
                        return true;
                    }
                    else
                    {
                        return false;
                    }
        }