Stream realtime audio over socket.io

Question

How do i stream realtime audio from one client to possibly multiple clients with socket.io?

I got to the point where i can record audio and playback the audio in the same tab.

That's my current code for this:

$(document).ready(function () {
    var socket = io("ws://127.0.0.1:4385");

    if (navigator.mediaDevices) {
        console.log('getUserMedia supported.');

        var constraints = { audio: true };

        navigator.mediaDevices.getUserMedia(constraints)
            .then(function (stream) {

                let ctx = new AudioContext();
                let source = ctx.createMediaStreamSource(stream);
                let destination = ctx.createMediaStreamDestination();
                source.connect(ctx.destination);
            })
            .catch(function (err) {
                console.log('The following error occurred: ' + err);
            })
    }
});

How do i send that audio stream to my socket.io server and then back to another client?

I heard about WebRTC, but i don't want a peer to peer solution as this would put load on the client, if there are multiple clients who want to listen to the audio.

Somehow there has to be a way to retrieve the raw audio data send it to my socket.io server which in turn sends it back to clients who want to listen to it.