How to make lan as the default gateway and make static routing for wan works

Hi @Dmitry ,
Currently I trying to create an environment with 4 vyos router with OSPF routing.
And i try to change routing using PBR but its not working probably because its not feasible with OSPF?

Below (Cisco) is the situation that I want to try on Vyos.

Below is Vyos design on my gns3: