One of our users reached out to ask about this feature.
If a business has "claim this business" text in the source then this business is not managed by the owner. Each business can include information such as "official_listing": True or "official_listing": False in the JSON response.
If "claim this business" can be found in the source code, official_listing would be False. If not, it can be true. In case there is not "claim this business" in the source, it should always be True.