That’s because the inibuild A359 only has 324 seats, it would be impossible to create an aircraft with all the different seating configuration for every single airline, all you need to do is customize the simbrief profile and change the amount of seats and save it as ini JAL A359 or which ever name you like
actually I made one for you
https://dispatch.simbrief.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