Elevate Almalinux 8 in LXC Container to Almalinux 9

Hi there,
is there a way, to elevate AL 8 to AL 9 which is running as a LCX container (Proxmox host)?

leapp preupgrade exits with 1 error:

Actor: scan_source_kernel
       Message: Unable to obtain kernel information of the booted kernel: no package is providing the booted kernel release returned by uname.

That’s logical because inside a CT no kernel is installed.
Any other ways to skip the kernel check?

thanks, Frank