@florhizome has packaged nbfc-linux for Guix in 2022, but documentation is missing as to how to configure and run it in Guix, and unfortunately they went MIA since.
nbfc seems to expect working only with configuration files in its own installation folder, and the service nbfc_linux cannot be fed directly with a configuration file: the configuration file has to be set and then applied with nbfc config first, before nbfc_linux can use it. This won't work in Guix, because nbfc will try to do so in the installation folder, which is read-only.
This documentation explains that the way to get nbfc_service to load a configuration file when the package is installed in an immutable read-only folder, like /gnu/store/*nbfc-linux*/, is to create a custom nbfc.json somewhere that conta
