It's sometimes useful to have the possibility of using a bootloader that's not
located at one of system disks.  For example to verify that the new bootloader
configuration is working correctly, without actually saving it to disk (e.g a
new openSUSE setup, while the bootloader comes from a previous openSUSE / linux
installation, with partitions at the same disk).

As such it will be useful to have to possibility to enable the creation of a
bootloader image.

This can be done, by adding a radiobutton at the bootloader options tab [1],
that enables the creation of the bootloader ISO image.  The ISO image could be
stored in /boot/grub2/bootloader.iso  The ISO will be around 12-15 MB.

[1]:
https://doc.opensuse.org/documentation/leap/reference/html/book.opensuse.reference/cha.grub2.html#sec.grub2.yast2.config.advanced.tab1