Why cannot use ipsec as gateway?

[realtebo]

PROLOGUE: this is my first VPN lan-tol-lan using pfsense and ipsec.

This is my ipsec tunnel. I CANNOT touch this.

It's stable and working.

For example, I can use

 ping -S 10.68.245.193 10.68.245.202

This because the other side of my ipsec requires and forces us to present ourself as 10.68.245.192/29
I cannot change this

I am now trying to configure a IPSec as a gateway, because (as my end goal) I need to automatically route all trafic directed to 10.68.245.200/29 through ipsec.

The problem is I cannot see ipsec as a gateway [ System -> Routing -> Static Routes -> Edit ]

Also I cannot add ipsec as a new gateway because it's not listed in the interfaces [ System -> Routing -> Gateways ->Edit ]

I supposed there is something of firewalling/routing theory I miss.