I am not sure, that would work. You could train a model that analyzes data and then feed it the data you want to transform. The data wouldn't be the training data then but part of your request.
Like you can feed a book into GPT4/5 and then ask questions about it.

For what you describe you wouldn't really need AI just a more or less fuzzy parser (like the scan a receipt, get the prices ocr things). Unless I didn't get it.