Hello Hayato,
Welcome to Atlassian Community!
On Atlassian Cloud products, when managing users and groups, currently there is no option to bulk update.
In order to add users to a group, it's possible to select many users and that's the only option for now.
There is a feature request suggesting the option to Bulk update:
Please, click on vote and watch to receive updates about the feature.
Regards,
Angélica
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