see https://forum.inaturalist.org/t/how-do-you-filter-records-based-on-observation-fields-for-instance-host-plant/35584
also see https://forum.inaturalist.org/t/listing-of-organisms-associating-with-a-particular-plant/29428
and https://forum.inaturalist.org/t/add-interactions-to-species-pages/433/2