It is very hard to explain Arcan but I tried:
https://www.theregister.com/2022/10/25/lashcat9_linux_ui/
I talked to Bjorn Stahl quite a bit before writing it, but he is so smart he seems to me to find it hard to talk down to mere mortals. There's a pretty good interview with him on Lobsters:
https://lobste.rs/s/w3zkxx/lobsters_interview_with_bjorn_sta...
You really should talk to him. Together you two could do amazing things. But IMHO let Jupyter go. There's a lot more to life than Python. :-)
An article called "A Spreadsheet and a Debugger walk into a Shell" [0] by Bjorn (letoram) is a good showcase of an alternative to cells in a Jupyter notebook (Excel like cells!). Another alternative a bit more similar to Jupyter that also runs on Arcan is Pipeworld.
[0] https://arcan-fe.com/2024/09/16/a-spreadsheet-and-a-debugger... [1] https://arcan-fe.com/2021/04/12/introducing-pipeworld/
PS: I hang out at Arcan's Discord Server, you are welcome to join https://discord.com/invite/sdNzrgXMn7