Installation from running Linux OS (bootstrap)

Hello guys,recently i moved all my Linux installations to different BTRFS subvolumes. I am now wanting to install Opesnsuse on a subvolume like i did with the rest of the OS’s i am running but i cant rally find any informations regarding it. I know that subvolume installations are not supported by any distro at this moment but there is a workaround with bootstrapping the Os’s. Cant find any information on how to bootstra Opensuse from a running os either. Only information i found on the net is this script, that i was not able to run. https://marc.waeckerlin.org/computer/blog/bootstrap_opensuse