You need to install Quarto. I’m using VSCode with Python environment named env inside project directory - in that case Quarto will use it by default, all you need to write jupyter: python3 to render a document with it.
Ctrl+Shift+K renders the Quarto document in VSCode.
Note
The RFM stands for Recency, Frequency, Monetary and helps to segment users by these dimensions.
The main point is to look at a distribution of users inside Recency & Frequency bins - amount of users inside a bin and their Monetary value can be used as written number and bin color opacity interchangeably.