Any way to apply labels for hosts created with the Rancher CLI?

Hi, we are experimenting creating hosts using the rancher cli, which is working very well for us, but, although you can tag (as ec2 tags) we are unable to see a way to apply a rancher host label, it defaults to amazonec2 (as per the example).

We would like to apply different host labels so we can allocate services to different hosts, i.e. for example gocd-server and gocd-agent.

Wondered if anyone has any ideas?