You really want to use Google Sheets for this. It's a free spreadsheet tool that works with all of the other Google tools (Drive, Docs, Slides, Calendar, etc.)
You can, if you want, also share it with anyone, and people can work on it collaboratively at the same time, anywhere in the world. You control all permissions to the file, whether view only, or edit access.
Then you can keep a link to this Google Sheet on your Scratchpad on your home page in WikiTree.
I've done this a lot.
Edit: Oh, and Google Sheets can read in an Excel spreadsheet. So you don't have to worry about converting it or re-building it from scratch.