title: Using different font styles in annotate (ggplot2)
body: <p>I'm using the code below to generate a simple chart with some annotations:</p>
  
  <pre><code>require(ggplot2); data(mtcars)
  ggplot(mtcars, aes(x = wt, y = mpg)) + 
    geom_point() +
    annotate("text", x = 4, y = 25, label = "This should be bold\nand this not",
             colour = "red") +
    geom_vline(xintercept = 3.2, colour = "red")
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/EW7AJ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/EW7AJ.png" alt="Simple plot"></a></p>
  
  <p>On that chart I would like to apply <strong>bold font</strong> to the first part of the phrase in the text annotation:</p>
  
  <blockquote>
    <p>This should be bold</p>
  </blockquote>
  
  <p>but the I wish for the remaining part of the text to remain unaltered with respect to the font face and style.</p>