Printing Over ZTNA Proxy

Hi All, 

I'd like to preface by saying that I'm running FortiOS 7.4.5 and FortiClient EMS 7.4.0

As the Title suggests, I'm attempting to allow users to connect to in office printers over ZTNA proxy. This is the client ask, and I'm not entirely sure if it's feasible yet. The printers are connected to a windows print server.

Would I need to open up line of sight to the individual printers, or could I just open ports to the print server itself. Currently, I have 445 open to the print server, so I can see the shared printers, however I'm not able to install them.

Any feedback or information would be helpful.

Thank you