Here's an emacs yas-snippet that does the same thing (and was inspired by yours)

    # -*- mode: snippet -*-
    # name: Piped Inspect
    # key: pin
    # --
    |> IO.inspect(label: "$2$1 (`(buffer-name)`:`(line-number-at-pos))`)")

I also like to use a non-piped version:

    # -*- mode: snippet -*-
    # name: Labeled Inspect
    # key: lin
    # --
    IO.inspect($1, label: "$2$1 (`(buffer-name)`:`(line-number-at-pos))`)")

And occasionally a logger-based one:

    # -*- mode: snippet -*-
    # name: Logger Inspect
    # key: logi
    # --
    Logger.info("$2$1: #{inspect($1)}")