Everything about shields is scripted; meaning that they don't really have much to do with OXCE development, they depend on the modder's skills and decisions.
Scripting is a rare skill, and most modders simply don't have it. But if it can be done on the current OXCE engine (which I am not sure about), then maybe someone else can rise up to the task.
I personally wouldn't do this, because the game doesn't tell you the number of HP lost either. But you can check it with a mind probe. Similarly, using some device to measure shield levels would be okay.