Story plotting app idea I'm working on

Please tell me if you think this would be useful for you.

I'm working on a story plotting app which focuses on value changes as the basis of the app. For each section of the story (beat, chapter, act) there are value changes (characters getting closer or further from some goal, threat, or other value). And I want to visualise these changes on a graph, so you can see how everybody's fortunes rise and fall.

There will still be the standard components, something similar to index cards to plot out the actual action of each chapter and beat. But the unique addition that I'm bringing here is you can see everybody's changes of fortune, like watching the stock market, or maybe like reading music.

It will be a desktop application (written in python and JavaScript).

So, does anybody think this would be useful to your writing? Are there other things you might want to see added to such a piece of software?