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This can only be achieve if you start openvpn via ssh.

What you can do is: first, choose the ovpn and start it via the UI. Of course it will not connect.

Then you ssh to the router, you can find the openvpn process using ps -w
You can record the full process, kill it and start it manually

openvpn -f /etc/openvpn/xxxx.ovpn