Assign specific folder to Nextcloud user in B2 bucket external storage

Hi everyone,

I have configured a Backblaze B2 bucket as external storage in Nextcloud. Right now, when users access the bucket, they always see the root of the bucket, which exposes all folders.

I want each user to see only a specific folder inside the same bucket, so that users don’t have access to each other’s data.

I don’t want to create a separate bucket for every user for isolation, as this is not scalable.

My question:
Is it possible to achieve per-user folder isolation inside a single B2 bucket in Nextcloud? If yes, how can I configure it?

Thanks in advance