I finally created a service that invokes dhclient
.
$ sudo vi /etc/systemd/system/eth0.service
[Service]
Type=oneshot
ExecStart=/bin/bash -c "dhclient -i eth0"
[Install]
WantedBy=systemd-networkd.service
$ sudo systemctl enable /etc/systemd/system/eth0.service
$ sudo systemctl restart systemd-networkd