OK, a quick test: "coal pits mentioned in wakefield manorial rolls"
Yes, it comes back with a short summary and a few snippets. At first sight the snippets look as if it's been at work summarising things until I look at the sources.
What would you expect the sources to be for that prompt? A good selection of WMRs are on archive.org so there's no problem getting that answers is there? Except the sources are just secondary publications, True at least one of them involves material not on archive.org (AFAIK 1402 isn't a published roll) but clearly the snippets are either just bits of human summaries or, even worse, AI summarised bits of human summaries.
Maybe I'll go back and try a prompt that can only be answered from real sources.
I did that:
Prompt: "how many fines were issued in published wakefield manorial court rolls for digging coal but not selling it, digging and selling it and just selling it"
Answer: "Based on the available search results, it is not possible to provide a precise count of fines issued in the published Wakefield Manorial Court Rolls for the specific categories of digging coal but not selling it, digging and selling it, and just selling it. However, the search results do provide some relevant information about coal-related fines in the Wakefield "
It's perfectly possible. It's just a matter of going through and keeping 3 tallies.