It's not possible to use the space from system 2 for data
System 2 is part of your partition table which is kernel related. Kernel is closed source as far as I know so not possible.
The partition table has nothing to do with the kernel. You could easily repartition your device.
The big problem is that it seems to use a different format because if I read the table via fdisk it shows wrong sizes.
So changing sizes with this tool would brick the device.