if my VM's are not created using virt-manager or are created using any other tool, then virsh system list command does not give them in the list of running VM's however they are running perfectly on my KVM server. Is there a way to list these VM's in my system list anyhow?

I have VM's managed by GKVM, AQEMU, libvirt etc. also some of the user start their VM's using the qemu command as follows:

kvm "image name" -m "memory". this starts the VM and allow them to work perfectly. but I am not able to list all these VM's using the virsh system list command.