cloud-init multiple interfaces

[churnd]

Is there a way to set policy based routing rules via cloud-init if a VM is using multiple interfaces? Usually it'd involve something like this in /etc/network/interfaces or some such file in /etc/network/interfaces.d/:

iface eth1 inet static
   address 10.10.0.10
   netmask 255.255.255.0
   post-up ip route add 10.10.0.0/24 dev eth1 src 10.10.0.10 table rt2
   post-up ip route add default via 10.10.0.1 dev eth1 table rt2
   post-up ip rule add from 10.10.0.10/32 table rt2
   post-up ip rule add to 10.10.0.10/32 table rt2

with a table named "rt2" added to /etc/iproute2/rt_tables