After successfully testing an OpenVPN link on a x86_64, I get the
error on aarch64, as root:
# nmcli connection import type ovpn file <file>.ovpn
Error: failed to find VPN plugin for ovpn.
So having tried that same command with a openvpn profile I use daily I
had a look at the manual  to check to see if I could list plugins.
It mentioned "type values are the same as for vpn-type option in nmcli
connection add" so checking that out I got a lst of the following
That gave me a slightly different error related to my actual config,
but to start it seems you need to substitute ovpn for openvpn in you