I think the closest thing to that vision is setting up a reverse proxy, configured with only access to the specific Perspective project(s) you wish to share.
If you mean another Ignition gateway, then yes. Configure the DMZ gateway's remote tag provider to only have read access to the back end gateway's tags.
If you are using just Ignition's historian, there's nothing else to configure. The front end's trend requests will be routed to the backend.
If you use the same tag provider name, then your back end projects will Just Work™ on the front end gateway.
If you're talking the DMZ layer between say the plant network and the corporate network then yeah just spin up another Ignition gateway in the DMZ and connect it via the gateway network. If you're talking your corporate network's DMZ to the public internet then you need a lot more for network security. Just thought I'd mention the second half.