I received answer from Emil, from MikroTik Supportm and he says
Hello,
RouterOS has policy based IPsec only. You can configure 0.0.0.0/0<->0.0.0.0/0 traffic selector, but you will not be able to route specific traffic over the tunnel, so that really is not an option at this time.Emīls Z.
So right now BGP will not work with local and remote traffic selector set on 0.0.0.0/0
Which means Using GCP VPN along with BGP isn’t possible right now with MikroTik. Maybe a case for MikroTik Developers to fix this.