Hello @Akane
If you're OK with using third-party add-ons, I recommend you to try Time in Status for Jira Cloud or Time between Statuses add-ons.
The main functionality is to generate status time reports, but in both add-ons you can configure calendars according to your working hours, excluding holidays or non-working hours from the calculation.
Time in Status for Jira Cloud
Time between Statuses
These add-ons are developed by my SaaSJet team. Please, let me know if you have any questions or get a 30-day free trial version.
Hope you find it helpful
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