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Re:Show HN: Figr.app – a multi-user, notepad style calculato... by larrywright on Tuesday September 20, 2022 @09:49AM (#32911636)
A Jupyter notebook would work in much the same way, and has the advantage of being able to mingle Markdown in with the code.

Neither is as approachable for a non-programmer as the OP, however.

Re:Show HN: Figr.app – a multi-user, notepad style calculato... by 20after4 on Wednesday September 21, 2022 @12:13AM (#32920749)
https://observablehq.com/ is another option, similar to jupyter but perhaps more approachable for people who like JavaScript over Python.

I'm still looking for the perfect text-based solution.