How to get dense depth map when I switch camera to telephoto camera?

I want to get depth map that when camera zoom in or zoom out or switch to telephoto.

I have got the depth map using ARkit that provide depth map that the colored RGB image from the wide-range camera and the depth ratings from the LiDAR scanner are fused together.

Now I want to switch camera to telephoto and hope to get new depth map.

How to get dense depth map when I switch camera to telephoto camera?
 
 
Q