Set private-key directly on vyos 1.3

Dear Developers,
Could you please change set private-key in vyos 1.3 just like we set it in vyos 1.4 way

set interfaces wireguard wg01 private-key 'oDZ2S/4S6UEuhOyk0MvNSQTebugihX5RKxxxxxxxxxxxx'

then I can easily setup and restore wireguard configuration?

Currently, I can set it with Ansible or cloud-init with terraform. Never mind.