As far as I can remember, the documentation example did not work for me.

I think it is because I had built a custom image on which nmcli was
running because the network-manager service was automatically started,
unbeknownst to me.

Beyond the installation process, I think my example is also relevant for
at least one of the official "lightweight-desktop.scm" configuration
file for which the default way to connect is nmcli.

--
Pierre Neidhardt