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Some character sheets have an ammo function that could be used for that. That's about the only option for free accounts. If you're playing in a game where the creator is a Pro subscriber, there are several API scripts that could be used.
Not a macro, but you could deal a number of cards equal to the charges to the player, and as they use them, they discard a number of cards equal to the charges used...
Make a wand token assigned to a character sheet with one of the bubbles linked to "other resource " and keep track of the charges there. The player will be able to update the charges used on the token and it changes it on the sheet.