Request to add Tax collected at source (TCS) option on purchase bill amount

I have attached 2 images

On the first image I am adding a product to the purchase document where I have input the following values
1 quantity
2 price before tax
3 Tax rate

Based on the above inputs on the second image we see the below
1 Total before tax
2 Tax
3 Total

Can you provide an option to further add a tax after the Total ?

This is useful in cases of TCS collection on purchase of goods, where and additional tax is collected on the Total bill amount after tax