Discount Qty

-- HikaShop version -- : 6.2.0
-- Joomla version -- : 6.0.2
-- PHP version -- : 8.3

hi
how can i create something like attached image in hikashop ?
the quantity of products in my site is unlimited, but i want sell only 20 of each with discount

i know there is an option in create discounts to limi the number of pacheses, however i want to show how much of that product has been sold with discouns

something like attached image