(shameless plug) I don't know if anyone would be interested in taking this but I have what I think is a really nice project. Integrating this;

https://github.com/ironcalc/TironCalc

Into the main repo :

https://github.com/ironcalc/ironcalc

Now, I'm not 100% convinced ratatui is the way to go after seeing what the folks of Microsoft did with edit.

Anyhow, I think TironCalc is a great open source project to work with Rust and Ratatui.