I am not expecting it to translate the metadata. But I was hoping Apple Music to load the correct version based on the language of the app. The only workaround, I find so far, is to load the Mac OS in Japanese. Then it will show the content in Japanese instead of Romanji. That is what I do on my iPhone. I choose Japanese as the language, so that all song titles are shown properly in Japanese. But it is at exactly convenient for a non-Japanese.
Same as what you see in Korean, maybe some artists below also choose to show Japanese even in an English environment but some do not:
