I managed to export from the proxmox version to VirtualBox.
This is the ZimaOS v1.3.0-2 version
You have to enable UEFI on the machine for it to work. But do not enable secure boot.
The file is .vdi
Link Mega: https://mega.nz/file/TApEQSzA#PTBBG00RH6e2gvhsvEkrgdqzDPSHYdxOpo7KklPVSsM
Link 1ficher: https://1fichier.com/?zrsdq1dmafjmj6b9b95t