Hi @JMR1592,
Welcome to the KNIME Forum! We have a team working on integration of Large Language Models (LLMs), but as of now what you are looking for is not really possible in KNIME unless you use one of the community-built ChatGPT integrations. See here for a discussion. But ChatGPT will cost you, while the open-source LLMs I have seen so far have not really lived up to the hype. I do not think they will be able to generate a continuous and coherent story for you.
If you go ahead with ChatGPT/GPT-4, I think you will need to do some experiments yourself. The prose, characters, and summary need to be presented to the LLM in a prompt, a text telling it what to do. This text you give to the model and it should respond with the output. Try it on https://chat.openai.com/chat first and see if the results you get are satisfactory, then you can start automating the generation in KNIME using for example this workflow as a starting point.
Kind regards,
Alexander