Hi there, KZH28.
While there's not a way to add a serial number for the item, you can add the figures in the Sales/Purchase information box. Then, manually edit them for tracking purposes.
I've added a sample screenshot for your reference.
I'll make sure to take note of this suggestion and pass it to our product engineers. Most of the update comes from our customer's feedback, and this might be added in the future.
Feel free to reach out to us if you have any other questions or concerns. Thanks.