Yeah, if you create a personal list, there’s an option to “Add Batch” from which you can add a plainlist of scientific names or import a CSV:
Lists can be a bit buggy as far as displaying what you’ve actually observed, so I usually end up using the URL qualifier list_id= and adding it to the Explore URL, e.g. this list of “spring wildflowers” I’ve observed in the Chicago region. Downside is that it’s not yet sortable taxonomically like lists are, but that’s hopefully going to be incorporated into the Explore page soon…