Gift Box Option in Checkout

I want to add a Tick Box Option in checkout Process where Customers can Tick that Box and get their Products wrapped in a Gift Box for some additional Amount. That gift box cost should gets added to total as well. Not sure how do I do it ? I added a Field to Checkout Flow diagram but it did not worked

I asked them this thing a while ago, and apparently it's only possible through HikaShop business version.

www.hikashop.com/forum/development/86389...-and-other-issu.html