Clinical documentation is vital for continuity of care but increasingly burdensome due to administrative demands. This study applies a co-design approach grounded in human-centered AI principles to inform AI-supported documentation system for rehabilitation. Two virtual workshops with seven Swiss occupational therapists identified needs for structured, profession-specific summaries, integration of evidence-based resources, and GDPR-compliant systems with transparent logic. Participants also expressed concerns about automation limiting clinical reasoning and observational detail. These insights will guide subsequent design phases involving physiotherapists and patients.