Unable to add default gateway for multiple interface

[akgowda]

unable to add default route for multiple interface.

apiVersion: "k8s.cni.cncf.io/v1"
kind: NetworkAttachmentDefinition
metadata:
  name: macvlan-conf
spec:
  config: '{
      "cniVersion": "0.3.1",
      "type": "ipvlan",
      "master": "ens5",
      "ipam": {
  	"type":"whereabouts",
	"range":"192.168.100.0/24",
	"range_start": "192.168.100.200",
	"range_end": "192.168.100.201",
        "gateway": "192.168.100.1",
	"routes": [
		{"dst":"192.168.200.0/24"},
		{"dst":"0.0.0.0/0"}]
      }
    }'

output:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.244.1.1      0.0.0.0         UG    0      0        0 eth0
10.244.0.0      10.244.1.1      255.255.0.0     UG    0      0        0 eth0
10.244.1.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
192.168.100.0   0.0.0.0         255.255.255.0   U     0      0        0 eth1
192.168.200.0   192.168.100.1   255.255.255.0   UG    0      0        0 eth1