title: How do I annotate with power of ten formatting?
body: <p>I'd like my numbers in annotations be like {x}\cdot10^{y}, not as they are now: {x}E+{y}. Is there a suitable string formatter for this?</p>
  
  <p>The most ideal solution for me would be to use a format string, like '%.2e', but with automatic conversion to the power of ten representation.</p>