Need help with figuring out proper way to save player inventory.

• What are you trying to do?
  • I have an existing save system in place using JSON but I failed to realize how I'm going to save the player's inventory. Yes, I can technically use JSON for it but I feel like it's not going to be the right call.
• What is the expected result?
  • Being able to save the player's inventory, which includes the current available slots, items (which I have implemented as Resources), and each item's current slot position.
• What have you tried so far?
  • I tried using my existing save system and just adding an "inventory" object to save JSON but I feel like I'm missing something better.
  • I also tried saving my player's inventory as a resource but I've read somewhere that using resources as saves is a security risk.

I almost never post and I sincerely thank you for taking the time to read my inquiry :)