Create a World Anchor from a Spatial Tap Gesture?

World Anchor from SpatialTapGesture ??

At 19:56 in the video, it's mentioned that we can use a SpatialTapGesture to "identify a position in the world" to make a world anchor.

Which API calls are utilized to make this happen?

World anchors are created with 4x4 matrices, and a SpatialTapGestures doesn't seem to generate one of those.

Any ideas?