Following on from suggestions here we've made more Tax breakdowns available for output.

- Final Item Price - price_total_item_cost - The total of all Products in the Cart, with any applicable Tax added -  
- Final Total Tax Amount - price_total_tax_amount - The total Tax amount applied to any Products or Shipping Option
- Final Total Price Before Tax - price_total_before_tax - The total price of Products and the selected Shipping Option, before any Tax has been applied

Find the full list

Full changelog here