So the effects you are seeing in the e-learning example are included as part of the projects that come with Verge3d. You can find those in the App Manager.
The effects that you are seeing in the e-learing is one part animation (keyframed in blender ) and one part a function of verge called “Outline” that is enabled in Blender. That V3D uses to create an overlay. This is found under Render Properties – Verge3d Settings – Outline. You can control the color and thickness of the outlines and a few other parameters but this is not a shader.
The original question was about a shader that looked like the example in Unity. If the Outliner works…then you are set.
If you are still looking for a method to reveal the hidden object as shown in your original link…I still am not aware of a method but will remain on the look out.