When invoking elixir on the command line, you can pass the -e/--eval flag multiple times. This means you can define a shell alias where you use Elixir's new Mix.install functionality to preload dependencies, and then run quick one-liners in shell pipelines that have access to those dependencies.
First, in your shell profile define an alias like this:
alias ee='elixir -e "Mix.install([:csv, :easyhtml, :jason, :nimble_parsec, :req])"'
Now you can call your alias like you would normally call elixir, passing any code you want to execute to -e, and your Elixir dependencies will be available:
$ echo '{"a": 1, "b": 2}' | ee -e "IO.read(:stdio, :all) |> Jason.decode!() |> IO.inspect"
%{"a" => 1, "b" => 2}