FortiOs 6.2.6 and SAML for vpn ssl

Hello,

I'm looking to deploy SAML authentification for our vpn ssl users.

I've been reading that this is available for 6.4, but it doesn't appear very clear for me regarding 6.2 version.

I found this documentation for 6.2 :

https://docs.fortinet.com/document/fortigate/6.2.0/cookbook/250178/saml-sso-overview

but it doesn't talk about vpnssl.

best regards,