It's possible to use RPGMaker Save Editors to change your items/stats/gold, but keep in mind that the dev might get annoyed if you file a bug report and it turns out that you broke the game because you cheated to a configuration which would otherwise be impossible to achieve.
You'd need to go to RPG MAKER MZ SAVE EDITOR (RMMZSAVE EDITOR) - SAVE-EDITOR.com and upload your .rmmsave file.
You won't see the name of the resource you're modifying (e.g "Ether" or "Maleficum"), but you can reverse engineer this by cross referencing the order and count against your inventory.