Out of the box, you cannot do this because they are just drawn in the overlay texture.
In theory, you can try to find these objects in the overlay texture by the presence of color, make a request to the meta data, and get the location from there. But this requires some programming experience from you and will be rather unstable.

I would like to place 3d markers on top of streetview points current available in a random tile/region a map. I saw that your code  already identify places that has images, since they get highlighted with a blue/purple overlay on the map. Is it possible to know the location of those places before hand ?