How can we specify language on iOS Safari?

I’m trying to specify language (English, Japanese etc.) in mobile web testing on real devices.
I succeeded in setting language by using language (and locale if necessary) capabilities in

  • Native apps
  • Android Chrome

But on iOS Safari it’s not working as expected.
Looking at the video on Sauce Labs,

Is there any way to resolve this situation?

hello @nkns165 , did you achieve any progress?