Source: https://gist.github.com/braian87b/64440dec125d2b2f0ddc600c490988db
# a new OpenVPN instance:
uci set openvpn.nord_us=openvpn
uci set openvpn.nord_us.enabled='1'
uci set openvpn.nord_us.config='/etc/openvpn/nordvpn.us.conf'
# a new network interface for tun:
uci set network.nord_us=interface