People use stuff like this in VRChat VR Eye-Tracking Add-on Droolon F1 for Cosmos（Basic Version） https://a.co/d/asAAZwT https://a.co/d/asAAZwT You can use it

People use stuff like this in VRChat VR Eye-Tracking Add-on Droolon F1 for Cosmos（Basic Version） https://a.co/d/asAAZwT https://a.co/d/asAAZwT You can use it with any headset cause the data it provides is independent of the headset. Not sure how accurate that one is in particular. Eye tracking data is not particularly complex nor super sensitive in nature. Once the sensor is calibrated it just sends over two vectors.