Dynamically extend pipe chains in Node.js

I'm currently practicing with streams in Node.js using the modules through2, concat-stream and request.

I set up a pipe chain like this:

request(process.argv[2])
.pipe(through(write, end))
.pipe(/*And */)
.pipe(/* Some */)
.pipe(/* more */)
.on("finish",function (){ #Do some stuff });

function write(buf, enc, nxt){ 
    /*Push some data after some processing*/
}
function end(done){ 
    done()
}

This is a static chain of pipes. Is it possible to, through some form of user input, dynamically specify a pipe-chain?

In pseudo code:

array_of_user_pipes = from_some_input;
pipe_library = {pipe_name:pipe_callback} object, loaded into application logic

perform the url request (fetch .txt file over the internet)
for all pipe in array_of_user_pipes do 
  fetch pipe from pipe_library (simple key look-up)
  chain pipe to chain
execute the (dynamic) pipe chain

via Lennart Kloppenburg