Import of chat history into a newly created Telegram chat group

A text file with about 250 short messages, with date and time, should be translated into the proper file to import into a new Telegram chat group to appear as chat history.
For example https://www.gizmochina.com/2021/01/28/telegram-rolls-new-update-to-import-chat-history-from-other-apps-like-whatsapp/