The Markup Annotation Tool is an easy-to-use tool that helps users convert plain text into structured data without any complications. Specifically designed for Natural Language Processing (NLP) and Machine Learning (ML) tasks, this tool leverages the power of GPT-3 to create structured datasets from free text. With its annotation capabilities, users can quickly and efficiently build datasets by adding structure to their text. The tool offers a demo for users to try out and provides a seamless starting point for those looking to incorporate structured data into their NLP and ML projects.