Currently, data restriction can be configured by choosing a property that contains the email address of the user OR a relation property pointing to the users’ database.
With this feature, you will be able to restrict data with other user properties. For example,
Every user has a “Group” property (Group A/Group B/Group C). When viewing a database (let’s say Posts) with a similar “Group” property, users belonging to a particular group can only see the Posts where their group matches the “Group” in a particular post.
This will make data restrictions even more powerful.