That’s what I think, only I can’t find the way, since ipfire generates a certificate for me but what I have found with pfsense is a different procedure.
The first option is only for the PFSENSE Plus version, I have the community edition unfortunately it does not have the option to Import client. if not the first video would have worked for me.
the second does not apply to me since Ipfire generates 1 .P12 and .Conf file
I am not familiar with pfSense but I would expect that if it does not allow the import of a client configuration that you should be able to manually set up the client configuration using the information from the IPFire .ovpn file