How to Display Inventory Warning Levels in Customer Center

Hello Experts,

We are using customer center for some of our customers. While we do have the option to show the available quantity of the item they are ordering on the custom form, we would like to hide the quantity and instead just give a warning pop-up if the quantity they order is more than available quantity in stock and if possible only show the stock qty in the warning especially when its lower than ordered.

Is there a way to do this ? Currently I see no warning pop-ups even if the ordered quantity entered in customer center is more than available quantity. So was wondering how this can be achieved.