I really love carbonation drops. One lemon drop size drop carbonates one beer. How many would go in a Tap a Draft jug?
I’ve had spotty experience with these things. Lately I’ve been over carbed on everything when I use them.
That said, if you have a product your comfortable with go ahead and use it. Scaling up from a 12 oz is not a direct relationship.
Maybe use 2/3 or less of what you would use based on the 12 oz dose.