In the Documents\Shapespark\SCENE-NAME\ folder on your disk, you can include body-end.html file. This file allows you to place your custom HTTML, CSS or JavaScript code.
In this file, you can place a Google Analytics script code. You need to create a Google Analytics account to replace UA-XXXXX-Y in this code with a proper value for your account.
After modifying the body-end.html file you need to upload or bundle the scene again for the changes to take effect.
If you place the same code in all your models, Google Analytics should allow to to see separate stats for each path, so for example you will be able to see how many visits zofffa_immersion_3d_prestige path had.