Below are some fnm outputs from a WSL2 install of Ubuntu 22.04 LTS:
$ fnm list-remote --latest
v0.1.14
# expected: "v.22.2.0"
$ fnm list-remote --lts --latest
v4.2.0 (Argon)
# expected: "v20.14.0 (Iron)"
$ fnm list-remote --filter 18 --latest
v18.0.0
# expected: "v18.20.3 (Hydrogen)"
Happy to learn some Rust and get a PR in if you all don't mind waiting a little while.