This document presents a comprehensive technical roadmap on smart and bidirectional charging for electric vehicles. It reviews standards governing interfaces between vehicles, electric vehicle supply equipment and electricity grids; identifies remaining gaps in standardisation, certification and testing; and recommends actions for global harmonisation. The roadmap focuses on light-duty vehicle categories (M₁, M₂ ≤5 t and N₁), covers communication protocols including ISO 15118-20 and Amendment 1, grid codes across multiple regions, and battery data identifiers under UN GTR No. 22. Key findings include: proprietary solutions and vendor lock-in remain prevalent; ISO 15118-20 has not yet achieved broad interoperability in practice; grid-code conformance regimes for AC bidirectional charging lack mature certification pathways; and end-to-end conformance testing remains immature in major regions. Main recommendations include establishing a Global Task Force on Bidirectional EV Charging, clarifying capability communication, ensuring regulations track standards evolution, extending electromagnetic compatibility requirements to partial-load operation, and maintaining consistency between automotive and energy-sector cybersecurity requirements.