How to add a line with connmanctl

Hello hello

I had to add to /etc/network/interfaces this line:
pre-up iptables-restore < /etc/iptables.rules
and then realised OSMC doesn’t use /etc/network/interfaces or network manager… and uses connman instead.

But I don’t know how I can achieve my OpenVPN server configuration since I didn’t find instructions to do so with connmanctl

If someone can help…