Get negotiated SSL / TLS encryption protocol from Conn

Phoenix Forum Questions / Help
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1

I need data about the encryption methods used ex:

TLSv1.3/TLS_AES_128_GCM_SHA256

Where might I retrieve it from a conn?

2 
negotiated_protocol(socket)
@spec negotiated_protocol(t()) :: ThousandIsland.Transport.on_negotiated_protocol()
Returns information about the protocol negotiated during transport handshaking (if any).

but what does it return?

3

I need the same for %Bandit.HTTP2.Stream{}