Is there a way to add a specify network routing through IPsec tunnel?

Dear All,

Is there a way to add a specify network routing through IPsec tunnel?

What I want to do is changing the route of 8.8.8.8 from local wan port to remote IPsec tunnel.

I know the following command, but it didn't work.

system ipsec_route add net <network/netmask> tunnelname <IPsec-TunnelName>

After I run the command on XG, the user can't connect to 8.8.8.8 through IPsec tunnel...