running guix services on Guix on foreign distributions

[Andy Tai]

Hi, is there any documentation on  how to run Guix services on an Guix
environment on foreign distributions?   I mean the services which
normally associated/managed by GNU Shepherd which of course would not
work out of the box when Guix is running on top of a foreign
distribution, typically with systemd managing the Guix daemon and all
system services in this case.