[Observium] snmp and unix-agent question

It might sounds stupid but I wanted to ask anyway. :-)

The same way the snmp works for distro and parsing the distro data, using: extend .1.3.6.1.4.1.2021.7890.1 distro /usr/bin/distro

is there a way to use the same or similar for unix-agent ? And parse all the unix-agent data plus any local scripts through snmp ?

The purpose to this is to parse the information of workstations behind multiple local networks with one single IP seeing the internet on every lan.

So I can use NAT/port forwarding to get different snmpd ports for every workstation on one IP, but I cannot use unix-agent. Is there a way?

Thanks in advance, Chris