That's really neat! SimpleGantt needs to be a bit more feature-complete than is easily supportable with something like that, but I love the simplicity. I am an avid user of TiddlyWiki and this would be a great addon to that platform.
I just discovered this last week. It works really well as an Obsidian plugin. The downside is that some of the usual Gantt chart features like dependencies are a bit weird to use.