According to Lens Studio's documentation, you can do 3d object tracking for the new templates with a helper script.
Scroll down to object tracking & 3D objects for the script:
I'm not exactly sure what is to be added to the "object tracking" section of the script. I get it that you are suppose to put what your 3d object should track to, but what kind of file is it exactly?
When I try to add something to it, the pop up menu just shows " no items here".