Bidirectional smart charging for Electric Vehicles (EVs) is currently focused on small micro grids through Vehicle-to-Home (V2H) or Vehicle-to-Building (V2B) systems. Despite research highlighting the advantages of integrating EVs into larger urban grids as Distributed Energy Resources (DERs), practical Vehicle-to-Grid (V2G) use cases remain scarce, limiting user participation as prosumers in the grid. This paper addresses the business model and system viability of bidirectional energy trading from public charging stations, proposing a solution tailored to the European energy market. By examining use cases such as EV-battery leasing, Demand Response (DR) contracts, Frequency Containment Reserve (FCR), and energy arbitrage, a comprehensive framework benefiting all contracted electricity market parties is proposed. The approach aligns with harmonized roles defined by ENTSO-E and IEC standards, ensuring international scalability. To manage cross-domain complexities, the resulting system is presented as an SGAM (Smart Grid Architecture Model)-based Computational Independent Model (CIM). This Domain-Specific Language aids in model implementation and provides a foundation for further exploration of its conceptual viability, focusing on grid efficiency, renewable energy integration, and seamless EV participation in energy markets.