These item card printouts were a little something that I would make for us when my friend and I were still playing D&D in person. We wanted a way to remember what magic items we had and how many charges they had. The best solution we found for this was to make little printouts that we could keep with our character sheets. Nowadays, I make digital images that we stick into the online software that we use (Foundry VTT) and everything is housed there.