I tried like this but it gave an error?
root@pve20:~# qm list | awk '{print $1}' | while read VMID; do qm set $VMID --onboot 1 ; done
400 Parameter verification failed.
vmid: type check ('integer') failed - got 'VMID'
qm set <vmid> [OPTIONS]
update VM 130: -onboot 1
update VM 146: -onboot 1...