create_macos_vm_install_dmg.sh (from https://github.com/rtrouton/create_macos_vm_install_dmg)  created two files:
+ macOS_1101_installer.dmg
+ macOS_1101_installer.iso

I used macOS_1101_installer.dmg with VMWare Fusion 12 Pro and I'm able to install macOS Big Sur (11.0.1)