Add plugins to OpenVPN

[TLK3]

I'm trying to add a Duo Security plugin (https://duo.com/docs/openvpn) to OpenVPN under OPNsense, but can't figure out how to load. It doesn't look like OPNsense uses a standard OpenVPN server.conf config file so I'm not sure where to load the plugin. Does OPNsense use an XML file for config data, like pfSense?

The OPNsense docs include a few plugins for OpenVPN (see below) -- so it seems like this should be possible.

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Plugin VPN options
Via plugins additional VPN technologies are offered, including:

Legacy L2TP & PPTP
Tinc - Automatic Full Mesh Routing
Zerotier - seamlessly connect everything, requires account from zerotier.com, free for up to 100 devices.
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If anyone can provide assistance I would appreciate it!