it’s not clear that the original poster actually needs to export data. it seemed to be contemplated mainly as part of a process to determine missing species. but if that determination can be made some other way, is an export necessary?
one thing to know about using this parameter is that it considers species that you have seen anywhere. so for example, if you’ve observed Taxon A but not in Park X (where others have observed Taxon A), then if you look for stuff in Park X unobserved by you, Taxon A will not be included in the list. if you want Taxon A to be included (because you’ve never observed it in Park X), then you need to use another tool like kildor’s above or https://forum.inaturalist.org/t/discover-how-many-of-the-top-100-most-observed-species-in-a-place-youve-spotted/66507.