How do I see SSL/TLS packet data in clear?
Sure.  Yes, you can capture the packets and view them.  That'll work.  It's a useful, informative exercise.

You can use Wireshark (or some other packet capture tool) to capture the packets involved in the TLS handshake and view the captured  packets.  It'll show you the raw bytes, and also decode the handshake messages for you.  Wireshark has a nice GUI that might make it easier to use, so I recommend that as your first choice, if you haven't done anything like this before.

I don't see any reason why you'd use SSL strip.