Reading HLS stream from Amazon IVS with timestamped metadata using PYTHON

Question

I'm trying to read HLS stream (Amazon IVS) using python (So I could process it with openCV for computer vision purposes). I can read simple stream with OpenCV although I notice a huuuuge latency (20+ seconds) comparing to what I see in a Live console of AWS. But putting that aside, I also want to be able to read timestamped metadata, which I need for frames processing. I can't see any reference in the docs for reading metadata with python, I can see events for JS, IOS, Android, Web in general, but nothing for server processing! This is extremely weird. I figured it has to be some kind of WSS, I asked ChatGPT and apparently it was available, but when I try the same approach I get: server rejected WebSocket connection: HTTP 200 error...

Is there anything I'm missing here? How can I read those events with python? The code I'm using is:

    # Establish a WebSocket connection to the IVS stream
    try:
        async with websockets.connect(STREAM_WS) as websocket:
            # Subscribe to the timed metadata event
            await websocket.send(json.dumps({"message": "subscribe", "data": "metadata"}))

            # Continuously receive and print the timed metadata events
            while True:
                metadata_event = await websocket.recv()
                print(metadata_event)
    except Exception as e:
        print(e)

where STREAM_WS ends with .m3u8 (I think that might be important because ChatGPT tells me about something about an Player URL ending with /live)...

I'm literally out of ideas