This is part of the motherboard and can only be changed with specific tools from the manufacturer. Back in the days there was AMIDEDOS
as a dos tool to change it in AMI Bios. You would need to find out, what tool can be used to change it in your UEFI. However, it’s possible that those tools are not available to the public.
@vaionko@sopuli.xyz I’ve found this (scroll down to #5 if it won’t scroll automatically). It shows some tools that can be used to change DMI information for different Manufacturers.