Using Youtube and Youtube Studio, you can’t publish a clean VR180 live stream with low latency. But in order to test the stream and the immersive feeling in your headset, you can try quickly.
You can’t publish in 4k directly using your browser, so you have to use a broadcast sofware like OBS (free software) and stream with your Youtube credentials.
Use OBS software with your youtube api key and stream in 4k. It’s very simple to configure.
Flag the video stream as a 360 VR video.
And watch your stream in a VR headset (live Oculus Quest 2, Meta Quest Pro, Meta Quest 3, Pico 4 or another VR headset with a compatible browser). In fullscreen, you will be able to choose the format (SBS VR 180).
The video will probably have about 30s delay and Youtube re-encore the stream with some strong parameters, decreasing the video stream quality.