I really wish google had public data for something like average page number or something similar for a search term. We have data for what people are searching

I really wish google had public data for something like average page number or something similar for a search term. We have data for what people are searching for, but its hard to determine how successful people are in finding what they're looking for. If you're searching for a niche, it would be great to know what people want but can't find. I suspect google already has this data, but it's too valuable for them to share.