Use raw disk image as Data partition

Hi,

Is it possible to boot libreelec by using a partition image instead of a partition on the sdcard?

so for example in the /flash directory i would have data.img

and when booting libreelec i could add it to the kernel cmdline

So instead of:

BOOT_IMAGE=kernel.img boot=LABEL=LIBREELEC disk=LABEL=LIBREELEC_DISK

I would have:

BOOT_IMAGE=kernel.img boot=LABEL=LIBREELEC disk=data.img

Is there such a functionality or do I have to edit the initrd to add it?