User and Group credentials for remote access to datasets from LINUX PC with WebDAV and FTP

I am having difficulty assigning the correct permissions in Directories and Permission of Users/Groups, and in Datasets, possibly setting the correct ACLs.
My configuration is as follows:

TrueNAS SCALE ver. 24.04.2.2.
POOL: n.2 SSD 230 GB configured in 1 x MIRROR - 2 wide - Mixed Capacity 230 GB
Users: A and B (plus root and admin)
User groups: 2 (single user A and single user B)
Datasets: n.6

I would like to allow remote access to the datasets from the LINUX Mint PCs of both users A and B, using Nemo file browser (WebDAV protocol - on TrueNAS SCALE I have installed WebDAV App ver. 2.4.62) and Filezilla (SFTP or FTP TLS protocol).

NO Windows - No SMB.

I would like that:
User A: access to 6 datasets with RWE permissions
User B: access to 5 datasets with R permissions, 1 dataset with RWE permissions

Can you help me?
Thank you !

The webdav app does not interact with user accounts configured locally on the TrueNAS server.

When I created the two Storage Configuration shares in the WebDAV App for users A and B, with Host Path on two separate datasets, the properties of the datasets changed automatically as in figure A, and the permissions changed from figure B to figure C.
How is it possible that WebDAV does not interact with the local configurations of the datasets?

FIG B
FIG C

The USER 1 and USER 2 folders are the HOME folders of the two users