CLI Command to view MAC on a specific managed switch port

We have multiple Fortiswitches managed by a Fortigate.  I need a command to see the MAC addresses on a specific port on a managed switch.  For example, I need to see the MAC addresses on port 1 of switch "1234." 

I can use this command to see "port1":

diagnose switch-controller switch-info mac-table | grep port1

But this command lists all the port 1s for all the managed switches.

I need a command that let's me specify which managed switch I want to view.

Thanks.