Configuring Automatic Failover for GRE over IPsec Tunnels on FortiGate

Hello, I need your help.
I have a Fortigate 100F running firmware 7.4.7, and I have configured GRE over IPsec tunnels.
My networks are routed using static routes.

The problem is that when one tunnel goes down, the traffic still continues to flow through the main tunnel, so failover to the second tunnel does not occur.

Is there a way to configure something like a link monitor or any other mechanism so that when Tunnel1 goes down, it automatically switches to Tunnel2