Per-user section of external storage

Is any support currently available for creating a global entry in the External storage configuration that either changes the locations of each user’s files to an external store, of that inserts into each user’s files an entry that represents a per-user section of an external store?

I believe at some time I had read of such a feature in Nextcloud, but I am having trouble finding any sources.

Thank you.

I am bumping this topic. I had thought that a feature was available, and have been hoping for some support. Thanks.