Merchant center conversational attributes

Google Merchant Center offers optional conversational attributes for AI-driven surfaces such as AI Mode: question_and_answer (product question-and-answer pairs), document_link (related PDF documents), related_product (a typed relationship to another product by identifier), item_group_title (a title for a product with variants), variant_option (every variant-defining property) and popularity_rank (popularity as a percentage). They complement rather than replace the core product data specification. At Google Marketing Live (20 May 2026) Google invited retailers globally to use conversational attributes to reflect the more conversational way people search.