Can I use one less managed switch with opnsense

[chuliu]

I have opnsense router running two wan failover with one lan.  The hardware have 4 nics, while I use only three.
My isp is hkt and hkbn.  HKT is also providing iptv service to me.  For the moment, I connect two cables, one to the wan1 of the opnsense and the other to a netgear managed switch.
Apart from the cable for iptv, there are one cable from lan port of opnsense, one cable that connects to the wireless ap, one that connects to a raspberry pi running pi-hole, and the last one that connects to a second managed switch which is in a room 10 meters away. 

I set up managed switches so that I can surf the internet, and watch iptv, all with the one cable between the two managed switches.

Please see the attachment for a current set up diagram.

I am looking for a way to use only one m-switch, by setting up opnsense's iptv passthrough functions, if it exists.


Please advise if this is doable and how to do it.
Thanks.