Gift cards in Shop

Site URL: https://www.donluciano.co.nz/graciascoffeeshop

Can I please get some advice for sales/invoice receipts on a commerce site for Gift Card purchases. This isn't a tax question - I'm wanting to know how I can set up these Gift cards so their totals price is 'tax inclusive' - but broken down on the sales receipt.

For example if a someone purchases a $100 gift card for someone, can their purchase receipt show like this: -
Subtotal: $86.96
Sales Tax: $13.04 (this is the 15% gst we pay in NZ on all purchases)
Total: $100.00

Client would like the sales receipt for the Purchaser to have this. Is this possible...? Screenshot attachment shows this item as currently having no sales tax. How would I set this for an individual item/s in the shop? I'm in the Brine 7.0 template.

Thank you : )
Lisa

PS - Just wanted to add, that sometimes businesses will purchase these gift cards for clients as a present - hence why they are asking us why there's not GST on their sales (gst = goods and services tax just for business owners only in New Zealand)