I found article at https://maierfelix.github.io/2020-01-13-webgpu-ray-tracing/

It is very interest theme.

Is there any way to implement simple raycast hit object detection in my small custom webgpu lib?

For example :

app.device.createRayTracingAccelerationContainer

OUTPUT: 
UNDEFINED

No help

        this.device = await this.adapter.requestDevice({
            extensions: ["ray_tracing"]
        });