Traditional product development relies on expert-led ideation and evaluation, which is time-intensive and may overlook valuable concepts. We present an AI-augmented approach engaging consumers directly in co-creation using an AI-powered conversational survey agent. Participants generate benefit-feature ideas with chatbot assistance, followed by rolling MaxDiff evaluation. This method produces human-created ideas with quantitative scores, AI-enabled analysis, and rich qualitative insights, demonstrating AI's potential for augmenting human creativity in product development.