Someone should do something like https://www.linkedin.com/posts/samerps_electromagnetics-electronics-b3d-ugcPost-7046079020844683264-X5RI for signals inside an IC...

I love the visualisations on Yuriy Shlepnev's YouTube channel. https://www.youtube.com/@simbeor/videos The software is not free or open source, but the videos are still very educational.