Web user permissions: restricting data view by App

Hi there,

I've seen several unanswered posts seeking info about how to set Web User permissions to restrict access to data for different apps within the same project space. Is this possible?

For example: We have one project space with 7 apps and about a dozen Web Users. One of these apps contains sensitive information. Ideally we would like to restrict access to this Data in CommCare HQ to only 2 Web Users.

How can we do this? There is only a "groups" feature for mobile workers, so I am having trouble finding a good approach for web users.

Thanks for your help!