If you're someone who uses Word or Excel a lot, or some other software for documents and spreadsheets, you might wanna try out SCEditor. It's a handy little tool that makes it super easy to turn whatever you're working on into BBCode formatting. SCEditors open source, written in JavaScript and it runs right in your browser. You can also run it locally if you want. I've used it a bunch of times and it always works pretty well for me.
https://www.sceditor.com/Simply copy-paste the content from your Word/Excel doc into SCEditor and, if needed, polish it up a bit. When you're done, click the "View source" icon (<>) to get the BBCode. As far as I've tested, tables and lists work like a charm too.