No equivalent to ip route add X dev Y

I need to find the netplan equivalent of the command

ip route add 10.96.0.0/24 dev ens3

Where the IP address of ens3 is 10.20.0.10/24. This is an unusual requirement, it's needed by kubernetes (see https://github.com/kubernetes/kubeadm/issues/102#issuecomment-291532883)

I have tried various attempts to capture this in netplan, and none of these even produce any routes at all (although netplan apply gives no errors)

I tried:

network:
  version: 2
  renderer: networkd
  ethernets:
    enp3s0f1:
      dhcp4: yes
    ens3:
      dhcp4: no
      dhcp6: no
      addresses: [10.20.0.10/16]
      routes:
      - to: 10.96.0.0/24
        via: 10.20.0.10

And I tried specifying

      routes:
      - to: 10.96.0.0/24
        via: 10.20.0.10
        scope: link
        on-link: true

I also tried

      routes:
      - to: 10.96.0.0/24
        via: 10.96.0.1
        scope: link
        on-link: true

Neither netplan apply nor rebooting actually produces any routes concerning 10.96.0.0/24 at all. The original ip route add command works well, what is the netplan equivalent of that?