You can do this by creating a list: https://www.inaturalist.org/lists/
and then using list_id= on the Explore page.
Such as observations of these spring wildflowers in the Chicago area:
https://www.inaturalist.org/lists/111820-Chicago-Wilderness-Region-Spring-Wildflowers
https://www.inaturalist.org/observations?list_id=111820&place_id=57482
You can also add a list of target taxa in Collection projects, though it’s a bit tedious if your list is large:
