There is a Hybrid Electric Vehicle (HEV) Simulink example model since the version R2023b which shows how to model a power-split hybrid electric vehicle with a simple rule-based controller for speed tracking simulation. It can be accessed here: https://www.mathworks.com/help/sps/ug/hybrid-electric-vehicle-model.html
Further, to design an anti-lock regenerative braking system by integrating regenerative braking capabilities into an existing ABS system, you can refer to the following MATLAB Answers post which contains several useful implementations and fruitful discussions on the same topic: https://www.mathworks.com/matlabcentral/answers/404664-simulink-model-of-regenerative-braking
