Advanced NUT configuration: is it possible ?

[shade_ch]

Hi,
I currently have nut server running on a separate device with what I would call an "advanced configuration" (multiple users, certificates, custom notifications script, etc.) In order to save power, I was thinking about using my opnsense box instead of a dedicate device, however the plugins' UI only provides limited configuration means. I found that nut configuration files are located in "/usr/local/etc/nut/" but some state that "Please don't modify this file as your changes might be overwritten..." which makes me think that my configuration may be lost quite easily.

My questions are:

• is there a way to have an advanced configuration with os-nut plugin which remains persistent after reboots / upgrades ?
• If yes how should I proceed ?

Thank you in advance !