The parallel hybrid driveline is a cost-effective solution with exceptional customer value. With this hybrid form, the combustion engine and electrical drive unit are placed in parallel and both act directly on the driveline. The big advantage: It requires only one electrical motor that gets by on moderate electrical power.
see also:
Hybrid Module – https://www.zf.com/products/en/cars/products_29311.html
8-Speed Plug-In Hybrid Transmission – https://www.zf.com/products/en/cars/products_34949.html