How to make ip route permanent

we add a route to clearlinux server and it works fine. see route below.
ip route add via dev ens001
we want to make it permanent. what is the right way to do it.
network is managed by system.networkd

You can create .network files under /etc/systemd/network/*.network for systemd-networkd to configure.

Have a look at the Route section of the man page.