Configure reverse proxy using nginx and nasxi waf for multiport web application

[anoop_304]

First I write about my environment:
I have an application server with IP address 192.168.2.26 on ports 80 and 8085 (both are non-SSL) .
I have installed OPNsense using a virtual machine using VMWare 8u2, which is equipped with two Network Cards. NIC-1 is the LAN interface with IP address 192.168.2.5, and NIC-2 is the WAN interface 192.168.3.55 with default gateway 192.168.3.1. Of course, the WAN interface accepts network traffic from another firewall through Public IP to NAT on 192.168.3.55 on port 443 and port 8085.
Web application server has been implemented in such a way that the landing web page response from  https://fqdn:443/mdu and in-turn, that web application calls https://fqdn:8085/api/v1/* for fetching and rendering the data in json format to display on actual web page.
This is required to be through Reverse Proxy configured using Nginx, which has been added using plugins os-nginx.
OPNsense is fully updated.   
     
Alos, I need to implement the OPNsense for below 4 features

1. DNS server for the Server Center (Data Center) LAN. Which i configured on LAN port i.e. 192.168.2.5
2. Nginx as reverse proxy, wherein SSL request should comes on both the port 443 and 8085 (initialled by application code itself) and goes to reverse proxied upstream server which works on port 80 and port 8085 without SSL communication.
3. NASXI WAF with maximum protection that can be done.
4. Crowdsec security.
.. Any I can also implement any other security feature such as IPS, etc.

From last 2 Months I am struggling for this implementation. Hence willing to approach to community support, if any one has idea what I can do to implement as desired.