PickUp and inventory

I want to ask for help with my pickup - inventory system. How can I count what and how many pieces were picked up also by click on “I” display the inventory?

This is how it looks. Very beginning…

I would like just to test out and write the counted stone numbers here next to the “stone”

Thank you very much. I’m just learning and I’m trying to figure out how it works.

To clarify, there are 3 questions?

  1. Know what child of BP_Item and how many of each when “i” is pressed. ← like a separate widget that pops up and remove itself after X seconds.
  2. Store items.
  3. Toggle inventory?