there is guix import for those who dare, but first we need all deps to be on hex.pm

$ guix import hexpm ecto_sparkles

Starting download of /tmp/guix-file.yFYLhV
From https://repo.hex.pm/tarballs/ecto_sparkles-0.1.3.tar...
 …es-0.1.3.tar  18KiB                 1.7MiB/s 00:00 ▕██████████████████▏ 100.0%
(define-public elixir-ecto-sparkles
  (package
    (name "elixir-ecto-sparkles")
    (version "0.1.3")
    (source
     (origin
       (method url-fetch)
       (uri (hexpm-uri "ecto_sparkles" version))
       (sha256
        (base32 "1iviggr15cw4i78mpm4k4ap8q8zvfxxbpjhrh1fzra7bdqhv4rfa"))))
    (build-system mix-build-system)
    (inputs (list erlang-ecto
                  erlang-ecto-dev-logger
                  erlang-ecto-sql
                  erlang-html-sanitize-ex
                  erlang-recase
                  erlang-untangle))
    (synopsis
     "Helper library to better join + preload Ecto associations, and other goodies")
    (description
     "Helper library to better join + preload Ecto associations, and other goodies")
    (home-page "https://hexdocs.pm/ecto_sparkles/")
    (license "Apache 2.0")))