[Feature] How do you pipe?

I'm trying the library out and essentially my question is how to execute the equivalent of the following:

grep 'text' . | wc -l

using this library without manually collecting the output of each step.

The run function signature only appears to accept one subprogram name as an argument to launch a single process (which is understandable).

The current outputs/inputs are types like String or Data, so it's not immediately clear how to 'pipe' the output of one subprocess to another, without resorting to doing it manually via an intermediate String or something.
I suppose all the shells on all supported platforms support piping so there could be a way to simplify this common task? (or maybe there already is?)

Start by reading the run function signature and the existing String and Data process input/output types. Trace how one subprocess is launched and how its output is consumed. Done means the library supports a grep-to-wc-style pipeline without manually collecting an intermediate result.