A web scraping script that picks up meta-data for SAP R/3 from the internet, and dumps it to an Excel sheet. https://will-list.co.uk/2022/11/21/sap-r-3-data-dictionary/
There are working example Excel sheets to import to SAP Power Designer - although YMMV on the actual import. https://will-list.co.uk/2022/11/29/importing-excel-sheets-to-power-designer/
There are scripts for generating XML from an Excel sheet, suitable for splicing into a Power Designer model.