These are in a Prefab, so you'll need to edit that prefab.
For context, your item grid/list is made of "Item View Slots" each slot has an "Item View" that the visual part which displays your item icon, name, quantity, price, etc...
To make it modular each of these parameters are actually managed by different components called Item View Modules: (IconItemView, NameItemView, AmountItemView, CurrencyItemView, etc... )
Your Item Views are usually prefabs that you set in your "Category Item View Set" within your Inventory Grid game object.
Depending on the category of the item you can draw different ItemView prefabs.
For the Shop you'll most likely see something like this:
Then on the Item View For Shop prefab you can change the component that displays the currency:
Make sure to read the documentation:
The base class “Item View Slots Container Base” is used by the Inventory Grid, Item Hotbar, Item Slot Collection View and more. Some options in . . .
opsive.com
The View and View Module classes allow for extensive customization when displaying the items, recipes, attributes, etc. These classes allow the View to display things . . .
opsive.com
Perhaps check out our video tutorials too:
opsive.com
I hope this helps