You should be able to use Gnome Boxes (out of the box) without installing anything on top of default Gnome. However, I am surprised qemu isn’t installed. I would install virt-manager to manage VMs.
All of those qemu-system-* are emulators for other architectures, but I see no x86_64 listed there. Without looking at it, I’d guess that the virtualization group only installed qemu for your primary architecture (which would be x86_64).