Is there any way to get KWGT to use the Jorte calendar?
Kustom apps use the calendars listed in his settings below Calendars, if Jorte isn't here I think that you don't have other option to add it.
I am requesting that it be added as an option. If others vote for this and support my suggestion, maybe if will happen.
If you want this as a request, you need to post it in Ideas