Actually TLS happens client and server side and protects data in transit whilst established. But that means over the network.

If you want to protect the actual contents you should encrypt it within your application and not rely on the TLS layer to protect it as various products, tools and services strip off this layer (for better or worse)

Lots of people think you can protect your data just by using TLS which is false. If you don’t believe that try using mitmproxy or fiddler.