The devs have mentioned at least being aware that some players want an option like this, from the JP side of the player base. Some find it jarring to see all the dialog in Japanese except when their character name comes up, and some JP players have requested the ability to set a Japanese dialog name. It shouldn't be a big ask to adapt such a setting to work for everybody and not just the JP client, if they ever implemented it.

I don't remember how long ago they mentioned this (FanFest 2018/2019 tour, maybe?) but it would be great if they could fit this in in the future.