ispConfig and ReverseProxy

Hello everyone,
I have mounted with great satisfaction on my part, ispConfig on an orangePi PC2 (it's like a raspberryPi3)
Now I want to put another 2 board (orangePi3) as video encoder and Streamer live for YouPHPtube, which needs 2 servers, one for the live encoder and one for the streamer.
(Note: YouPHPtube is allergic to control panels ispConfig, vestaPc, Plex ...)

The idea is to use orangePiPC2 with ispConfig as a firewall and service provider for apache2 (reverseProxy) in the second ethernet interface (eth1).
What I don't know if it can be done with ispConfig

It would work like this:
server 1 OrangePiPc2 with ispConfig an a couple of websites like wordpress. Fixed and Public IP address and FQDN (example: 123.123.123.123 -> ispc.example.org on eth0)
This server have a second ethernet interface on eth1 with IP address 192.168.1.1

Server 2 OrangePi3 (streamer) - Local IP address like 192.168.1.2

Server 3 OrangePi 3 (Encoder) - Local IP address like 192.168.1.3

The idea is to create 2 websites with two subdomains in IspConfig (server 1), for example: encoder.example.org and streamer.example.org.
But Apache and ispConfig would have to redirect network traffic to local server trought eth1 (192.168.1.2 and 192.168.1.3) respectively

I know that Apache2 can redirect traffic to a server on the local network, but I don't know if ispConfig can.

Any ideas?

Thank you
Max