Title quite says it.
Is there an official or unofficial installer package for Nix/NixOS?
Thanks
The official list of supported platforms is here:
https://docs.pi-hole.net/main/prerequesites/#supported-operating-systems
I saw that. That's why I included "official/unofficial" 
Also, wouldn't be the first project with outdated docs..
So you're saying it's not supported?
We're pretty good at keeping everything up to date 
I have not seen an unofficial package/installer for that OS.
There might be, but, definitely not supported.
No, it's not a supported platform.