Is there a way to add a Tip option for Wix Stores?

I have a client that wants to add a tip functionality to his wix store. His products are delivered locally by his drivers.

Is it possible to add this with Wix Code?

Currently it’s only possible for Wix Restaurants (Wix Restaurants: Allowing Customers to Add a Tip to an Order | Help Center | Wix.com). Thank you for your feedback!

This is really a feature that is urgently needed, especially right now with COVID.

I don’t know if it makes sense. But one could create two variants of the product .
One with a Tip and one without and the customer can decide which one to choose.
But you will have to specify the amount yourself or add different amounts and the customer can choose.

Something like this:
https://support.wix.com/en/article/adding-and-managing-product-options-in-wix-stores

For accounting purposes it would be important for them to differentiate what amount was a tip and what amount was for the actual item sold. This is a feature that is being requested more and more by my clients because of COVID.