Bulk update user custom attributes

I am managing my organisation of around 600 users, and we are trying to take advantage of custom attributes in order to build dynamic groups to control user access.

I can see there is a bulk update option for users via csv upload, but this only appears to include system attributes and not my custom ones.

Is there a way, either via the admin portal or via API that will allow me to bulk update the custom attributes across my organisation without going through each person individually?

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