safari web extension- managed storage

Hi all,

I am trying to use managed storage within safari web extension.
in the Mozilla documentation I can see that there are 3 storage types: local, sync, and managed.
I can only find sync and local within safari web extension.
does safari support managed storage?

if not, is there any other way for a process in the Mac to write policy to the web extension?
(in google chrome I'm using managed storage for that).

thank you!