Password protect with encryption individual folders within macOS Finder Dropbox (non-sharing)

Feature request,

Dropbox password protection for individual folders with encryption.

This would allow password protecting folders holding sensitive info.

An encryption feature that allows any individual folder within Dropbox to be turned into its own Vault-like folder. This encryption would be based on a complex password. The data would be auto-saved offline along with all other Dropbox data.

Different folders would have different passwords. When a given encrypted folder is opened (with password), it mounts the folder for available use like any other folder. These folders would have a timed-auto-lock function. The timed-auto-lock would have its own settings for how long of a delay (including 1 minute, 5 minutes, 1 hour, 1 day, and indefinite). The given folder can be set to be locked: no changes to files, only allow changes to subfolders; to make changes to a file, the file would have to be moved to another location, edited, saved, and then re-added to the given encrypted folder (like a backup archive).