That is the idea behind the Prius Plug-in and the plug in kits, but even tho they are a retro fit to a vehicle that already has an electric motor they are rather costly.
Most likely the simplest way to add on a hybrid is with something like a pusher trailer, or the drop down drive wheel like has been done on the honda insignt.
Adding hybrid to a front wheel drive vehicle in any other way is going to be pretty hard because you have very limited space to add a motor in.
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