nostr:npub1wkxhl5l7xmksz2s74w22leth5380j3dy74ujs7672cjf5zptwulsd74jw9 
In the following repo i have my #HomeManager config. Feel free to explore the rest of the repository aswell, but it is still a mess and i need to organise it better.
The relevant part here is the "extraEnv" and the "$env.config" of the "extraConfig". This enables fish completions.
https://codeberg.org/Chfkch/nix-config/src/branch/main/modules/shell/nushell.nix