a basic homebridge plugin with the webui (homebridge-config-ui-x) setup. The inital password/login for the webui is "admin/admin", please change it right away for security reasons. The mac/pin required by homebridge is generated at the time of the installation randomly just for you. The UI can be reached at port 80 on the IP you choose at the installation, this differs from the default but makes things more convinient as we use a dedicated IP for this.
I want to thank the following webpages/users for providing me pointers and hints to make this possible:
Homebridge @ Github for the basic guide to setup things on FreeNAS https://github.com/nfarina/homebridge/wiki/FreeNAS-11-Installation-using-a-Jail
SmartApfel.de for providing information how to setup the webui https://smartapfel.de/homebridge/plugins-installieren/
vermaden from the freebsd forums for sharing the code to generate a mac https://forums.freebsd.org/threads/randomizing-mac-at-boot.30603/post-170842