Product Owners are expected to be domain experts and often need guidance/advice from outside.
I have listed down some of the top market research and advisory firms which can help you with your R&D stuff.
One of the leading firm to provide guidance on Legal, Finance, Supply chain, IT, HR etc.
Forrester is an American market research company that provides advice on existing and potential impact of technology, to its clients and the public.
Ovum is a market-leading research and consulting business focused on converging IT, telecoms and media markets.
International Data Corporation (IDC) is the premier global provider of market intelligence, advisory services, and events for the information technology, telecommunications, and consumer technology markets.
Nielsen is a global measurement and data analytics company that provides the most complete and trusted view available of consumers and markets worldwide.