Adoption of user-centred design methods is essential in healthcare applications because it ensures that complex workflows are shaped around real users' needs and behaviours, improving usability, accessibility, and sustainability. The use of user-centred design in healthcare applications still presents open challenges for identifying user requirements, including diverse stakeholder needs, limited user availability, complex interaction workflows, and organizational constraints. To address these challenges, this paper proposes a user-centred interaction design framework that systematically supports the identification and translation of user needs into actionable design requirements. The framework integrates user-centred design principles with generative tools, employing the Persona-and-Scenario method to transform user insights into actionable design requirements. By actively involving healthcare stakeholders, the framework ensures that both explicit and latent needs are captured. The framework was implemented through two co-design events, which provided valuable feedback on data collection, visualization, interaction modalities, and privacy considerations. These insights were translated into functional, usability, and interface requirements for the Change Management Platform (CMP) for the KEEPCARING project. This framework introduces a structured, scenario-driven process that actively engages stakeholders in envisioning future states rather than merely refining existing systems. Its application demonstrates promising indications that it enhances requirement elicitation, promotes cross-stakeholder alignment, and yields higher-quality, contextually relevant design requirements.