Are you looking to see what options each User has selected?
If so you could have a Repeating Group of Users, and in it have the text “Current User’s List of Saved Items” to see the Items a User has selected
Really depends how you want to see and use the information. Overall though the :count function will help you out here.
In a Text element, you can put 'Do a Search for Users (constraint: Saved Items contains= Item Name):count to get a specific count based on a single item
Or instead of using a static Item Name in the Constraint, use Dropdown’s Value, and have a Dropdown with the Item options. Then you can select the option from the dropdown and it will do a count based on that specific item
You could probably use these counts in a Chart element as well to get a better visual representation of it