Plzzz update anyone
Sorry, there isn't one.
7.7 was released today which brings properties for logging SSL related info:
SSL.Client.Protocol & SSL.Server.Protocol, possible values would be SSLv3.0, TLSv1.0, TLSv1.1, TLSv1.2, and unknown
SSL.Client.Cipher & SSL.Server.Cipher, this would be the raw cipher suite string used.
There was also SSL.Client.Cipher.KeyExchangeBits and SSL.Server.Cipher.KeyExchangeBits which normalize the key strength of the exchange. For further reading check out Keylength - NIST Report on Cryptographic Key Length and Cryptoperiod (2012)
Client refers to the communication between the client and the proxy. Server refers to the communication between the proxy and the server.
I attached a ruleset that could be used to log the information.