You realize those reports would be quite useless? Like, in several ways. It might be a nice statistic to look at in awe, but useless.
Also, tags are dev chosen on itch. So it says little, just because a dev chose to tag horror as an example. Resident Evil series is horror. But those do sell big time; does not mean any horror sells big time, or that any horror you would make would sell because of shared tag. There is a bottom of the list, too, if you sort by tag. And especially if something is popular, the 50% that are the lower half gets also bigger.
You might get some inspiration here:
https://itch.io/games/top-sellers
I do not know how much time is included in that view or how it is weighted. But there is a 30 day button. So while you might not get a rating in numbers, you might see (or not see) a trend in certain tags. Or a common theme, or something all those games on top have in common. I failed to notice anything beyond the obvious: it is all indie games. And "horror" is popular.