You might like Treesheets, but you’re not going to be able to edit it on mobile with it. You’d have to save as HTML to view. It’s a grid-based editor that I use for stuff like this.

• https://strlen.com/treesheets/

• https://strlen.com/treesheets/docs/screenshots.html

• https://github.com/aardappel/treesheets

This thread has huge ham radio vibes and I love it.