Official plugin for Freeradius + OpenVPN?

Hello, I have been using Freeradius and Strongswan (eap-radius) for a few years now and for the first time I'm trying to achieve the same thing with OpenVPN instead. Based on my research it seems that the recommended plugin is a decade old. http://www.nongnu.org/radiusplugin/ It's hard to imagine that this wasn't updated for so long. Am I missing something? Is there any official Freeradius plugin for OpenVPN? I found this tutorial to be very promising https://www.vpsserver.com/community/tutorials/17/authenticate-openvpn-client... but I thought I ask here first if someone has experience with this topic, and I'm on the right path. Many Thanks, Houman