Elixir get_in with nested maps and lists

deeply_nested.exs

defmodule DeeplyNested do

  def get_nat_ip(input) do
    steps = [first_map_with_key("accessConfigs"),
             first_map_with_key("natIP")
    ]
    get_in(input, steps)
  end

  defp first_map_with_key(key) do
    fn :get, data, next ->
      Enum.find_value(data, fn %{^key => val} -> next.(val) end)
    end
  end
end

input = [%{"accessConfigs" => [%{"kind" => "compute#accessConfig",
         "name" => "External NAT", "natIP" => "146.148.23.208",
         "type" => "ONE_TO_ONE_NAT"}]}]

IO.inspect DeeplyNested.get_nat_ip(input)