openswan/libreswan VPNs and NetworkManager

I'm totally noob about VPNs and NetworkManager, so forgive me if I'm writing something wrong. I was trying to set up a VPN to my work company network. It seems I need to use IPSec XAuth PSK, so I found some guide in internet that says to set up a libreswan VPN. I'm facing several problems, first of all I'm using Plasma KDE which seems to not have a GUI for setup/editing libreswan VPNs. Plasma-nm only has support for openswan. I've reported that upstream and downstream. So I went setting up the VPN through nmcli: it doesn't work, but that's not my point here. I was wondering how both plasma-nm and nmcli allow to setup an openswan VPN since openswan has been retired in Fedora many years ago... it also seems to work (well, in some way, since the connection fails) even if there's no NM plugin or openswan package installed. How is it possible? Does NM bundles some openswan library itself? If so, is it updated (latest Fedora openswan build was 8 years ago) or there may be any security concern? Mattia