$ toolbox create virt-manager
$ toolbox enter virt-manager
$ sudo dnf update -y && sudo dnf install -y virt-manager virt-install
$ cp /usr/share/applications/virt-manager.desktop ~/.local/share/applications/
$ cat ~/.local/share/applications/virt-manager.desktop | grep Exec=
Exec=toolbox run --container virt-manager virt-manager