I would like to use the on-device optical character recognition feature offered by the Vision framework for reading Japanese text. Will this language be supported soon?
Will there be Japanese language support for VNRecognizeTextRequest in the near future?
Will this language be supported soon?
Apple rarely announces future plans except on some big events like WWDC.
It may be included in a minor update of iOS 15 in months, or it will take years, possibly never.
You can send an enhance request and wait. But you should not rely on anything else than Apple's official announcements.