If you can read code to some degree, you can look at what the plugin @dns_server talks about does here:
Basically, it takes some data input and places it into an HTML form, which you can then submit to prepopulate the Add Release page/form. I copied a lot of the “addrelease” code for my Spotify2MusicBrainz script (for which you can also look at the code).
This same approach could be used for any organised data, like data in a spreadsheet. Just be aware that we generally frown upon fully automated imports. See e.g.: