Hi Christian,
Thanks for your reply. I finally did it with a systemd unit because I don't need to deal with kernel modules and I can add dependencies easily, e.g. "Require=dev-nvme0n1.device", but I will follow the new feature for disk support.
I asked this question because I also have a problem with a shared network and other unconfigured interfaces down, even the system has completely started, and also I don't see any network driver on initrd; I wanted to try if it could help, but I haven't found how to edit this "root" field or, if it is not possible, if I have to change it manually in the container/image.
Regards,