You can also manually match each movie from the jellyfin frontend, but the issue with going this path is that if you need to rebuild your jellyfin instance for some reason, you would need to redo all of this manual matching.
So, the recommended path is to clean up the media files:
I'll setup jellyfin and see which titles I'm unable to add and try to collaborate on metadata. It's always important to favor opensource. I can always have both services running side by side.