I have read several times about people looking for a tool to plot and cut .sub files so I decided to link the one I wrote. It’s a python script that surely it’s not well written but for my use it is doing well. I hope it could be useful for someone else.
You can find it on GitHub at: https://github.com/cberetta/flipperzero_scripts
On the GitHub page there is also an example of use.
Below an example screen: