title: ggplotly: rename tooltip on hover
body: <p><a href="https://i.stack.imgur.com/6I52M.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6I52M.png" alt="enter image description here" /></a></p>
  <p>I have a plotly chart as above. Reusable code as below.</p>
  <pre><code>plotly::ggplotly(ggplot(dplyr::as_tibble(rnorm(1000)), aes(value)) + stat_ecdf(geom = 'line'))
  </code></pre>
  <p>I want to rename and format the tooltip on hovering.
  For example, x-axis or 'value' (in the chart) can be 'Unit Price in ฿' while the y-axis is the Cumul Distribution.</p>
  <p>So when I hover on the line, I want to be able to see something like below</p>
  <blockquote>
  <p>Cumul Distribution: 78.2%</p>
  <p>Unit Price : ฿0.81</p>
  </blockquote>
  <p>Thanks!</p>