How do I implement a custom packet? (Sending text from GUI to server)

Hello friends,

I want to send the text from a GUI text field to the server.

This requires a custom packet implementation.

I tried following the steps in this thread over here but the instructions seem to be outdated and do not work with latest MCreator.

Can anyone show me a basic example of a custom packet implementation that works with MCreator 2022.3?