To import your chats from chatGPT:
Go to https://chat.openai.com/ and login with your account:
Click on the three dots on the bottom left corner besides your email:
Click on settings:
Click on Data Controls:
Click on Export:
Confirm:
You should get an email from openAI containing a "download data export" button:
This will download a zip folder containing a "conversations.json". ONLY upload this file and then you should have your chats uploaded accordingly
Import your chats from ChatGPT