Unfortunatly this cannot be done generically with Play Maker since it does not support custom type outputs like the Item.
That means we would need to make a custom action for each of these returns: name, id, amount, definition, category, Etc...
I will add it to my Feature Request list, but I'm afraid it won't be high in priority compared to others.
So I would recommend you give C# a try such that you don't get stuck on this.
Even if you do not know C# you should be able to loop through the items in the Inventory.
We have a lot of simple examples in our documentation:
Inventories are a set of Item Collection objects. This makes more sense with an example. Let’s say that a character can have items in their . . .
opsive.com
And you can use them to create your own PlayMaker actions. You can read the existing ones and try to undestand them, through trial and error you should be able to get it to work the way you want.
Best of luck