I have made a similar tool but for the command line[1] with similar but slightly more ambitious motivation[2].
I really like that more people are thinking in these terms. Reasoning about sources of variation is a capability not all people are trained in or develop, but it is increasingly important.[3]
[1]: https://git.sr.ht/~kqr/precel
[2]: https://entropicthoughts.com/precel-like-excel-for-uncertain...