Add track to existing publisher stream

Hello, I’m trying to add an extra audio track to my stream. What I mean is that the publisher is going to stream the Video and Audio. But also I want to send an extra audio track (like a mp3) that I want to be listened by the subscriber or others publishers.

With simple peer lib I was able to do this doing this:
const audioStream = audioPlayer.current.captureStream(); const audioMediaStreamTrack = audioStream.getAudioTracks(); streamerPeer.addTrack(audioMediaStreamTrack[0], stream);

Here in openvidu I’m trying to do this (but is not working):
const audioStream = audioPlayer.current.captureStream(); const audioMediaStreamTrack = audioStream.getAudioTracks(); publisher.stream.mediaStream.addTrack(audioMediaStreamTrack[0]);

Could someone help me with this? Thanks!!