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Allowing customers to add a gratuity to an invoice isn't available, chef-theghostkit.
You can use the Tip tracking feature to hard-wired it into an invoice. Simply add a service item for the gratuity and include it on the transaction.
Before doing so, let's make sure to turn on the feature, so we can select the Undistributed Tips account when you set up the item.
Let me show you how:
Check out this article for further guidance: Add tips to sales receipts.
Let me know if I can be of additional assistance. I'll be happy to help. Have a great rest of the day.