How to pfsense proxy server use mikrotik client

I am configured pfsense proxy cache server http and https
my network topology

internet—>mikrotik-----> pfsense
mikrotik—> Switch

details under below

i use mikrotik port details
wan= port 1
lan= port 2 (static and pppoe)
hotspot = port 3
pfsense wan =port 4
pfsense lan = port 5

N.B port 2 and 3 used in Switch port 4 and 5 direct in pfsense
i want to pfsense proxy use mikrotik client like port 2 and 3

sorry for my English