I understand the need to have a plaintext format, but when did we forget that spreadsheet exist? I’ve used that for decades. Markdown is not appropriate for such a task, and actually it’s the worst of the text formats and only got popular thanks to platforms like GitHub.

Use Calc in LibreOffice. That way you’ll get a powerful application that does everything you need, you can export to CSV, and you don’t need to use Google Sheets which is very bad for the usability, longevity, and privacy of your data. Also you’ll learn new skills.

And that solution is not complicated or worse, it removes an inefficient text format, and replaces Google with another tool that you control.