Thank you for your question. We checked that as of now this business task cannot be achieved via basic tools.
We registered a problem to add the possibility to register tickets with different number types to our R&D team to develop such a function in future releases.
Unfortunately, you would not be able to put this value in the system setting manually and it is not recommended to change system setting dynamically. You can edit current year in the case number using business process. You can find more information about working with Date in business process here:
