Search online and download books in epub, txt, or pdf formats (non-scanned versions), such as the Z-library mirror site https://zlib.wwwnav.com/.
Log in to the format conversion website https://libra.beginner.center/, upload the books, and convert epub or pdf books to txt format.
Open the txt file, remove the headers and footers, keep the main text, and upload the txt to the Yijiantong dictionary conversion tool https://rimetool.beginner.center/. Select simple Chinese to generate the file.
Review and roughly edit the yaml file, then upload the book download link to the form WPS表单.