the iNat API does provide taxon ancestry for all the leaf taxa in an observation result set. so you could build something like what you’re describing yourself.
just for example, here are the leaf taxa in one of your projects, along with taxon ancestry: https://jumear.github.io/stirfry/iNatAPIv1_observations_species_counts?project_id=observacoes-do-andre-e-da-ines&options=ancestry
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also, there are plans to build dynamic lists for places at some point in the future. so this would effectively satisfy your request for projects that are based solely on a single place.
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if you would like to create something in Python, it looks like this thing might have the bones to do this: https://forum.inaturalist.org/t/tool-i-made-using-pyinaturalist-api/43908