ACL on DH filesystem

I’m in need to do a special configuration of SFTP/SSH user accounts for a costumer.
As far as I know I cant get those done using just GID permissions.
Does anyone know if it is possible to set ACLs permissions on the current DreamHost filesystem?

What I need is for new files/folders to be written by both owner and other users of the same group.

BUGabundo :o)
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