Mithril had supernatural qualities, not really indicated in the name. In the movie "LOTR", Frodo is hit with a huge spear point by a giant cave troll - and survived without injury. That would seem to imply a 'force field shield' more than an unusual metallic property. 🤷♂️ I guess make up your own judgment.
Force field is a little to “scientific” for the fantasy book and to my understanding of SciFi also implies something outside surrounding the object being protected not part of it.
Magic OTOH is clearly acceptable in the Tolkien world and I would not argue that his mithril coat might have a protective spell though that was not clearly stated in the novel per se we do know the Nazgul fought with enchanted weaponry that almost turned the Hobbit into a Wraith.