How to format mouse over labels using ggplotly in R?

**ARTICLE ISSUE NOTICE:** This article is about **R programming** (specifically ggplotly in R), not Python. The title and content focus entirely on R syntax, R packages (ggplot2, plotly, readr), and R-specific functions. However, the instructions specify this should be a **Python/Data Science** article. **RECOMMENDATION:** This article should either be: 1. **Moved to R tutorial section** (most appropriate) 2. **Completely rewritten** to cover Python equivalents (plotly.express, matplotlib, etc.) 3. **Replaced** with a different Python-focused topic **TECHNICAL ISSUES IN CURRENT ARTICLE:** - Code blocks incorrectly tagged as `language-python` when they contain R code - Missing proper R syntax highlighting - Install commands in `result` blocks instead of `code` blocks - Incomplete tooltip formatting in the example **IF THIS WERE AN R ARTICLE, IMPROVEMENTS WOULD INCLUDE:** - Proper R code block formatting - Complete working example with sample data - Better explanation of aesthetic mapping - Fixed HTML entities in code blocks **DECISION NEEDED:** Should I proceed to improve this as an R article (changing code block languages to R), or does this need to be converted to a Python equivalent tutorial?