The JS side is made in StimulusJS. You can take it, it's MIT.
I haven't worked with python and don't have plans to port it to React or anything else.
If you do start work on it, I can guide you though the process if you need a hand...
Hmmm... My responsible developer gut tells me to redo it in React so you don't import StimulusJS just to render one editor.
It's like having jQuery as a dependency in a React project.