Hard Filtering on Guest Network

We have an insurance company customer for whom we have cretaed a vlan guest for its end customers

Insurance company have its 3 others Vlan for security.

The firewall options allow us only to exempted a group of users (Manager, Guest or Staff) but we need firewall rules for Insurance company users.

We would like apply some more restrictive configurations (hard filtering) on the GUEST VLAN.
How could we configure that ?