title: How do I express a list or array of objects in yaml via a Spring placeholder?
body: <p>I know that you can override yaml config values with placeholders like so:</p>
  
  <pre><code>some-setting: ${SOME_SETTING:default value}
  </code></pre>
  
  <p>And I know that you can express lists of objects like so:</p>
  
  <pre><code>customers:
    - name: acme
      category: manufacturing
      employees: 200 
    - name: virtucon
      category: evil
      employees: 1
  </code></pre>
  
  <p>So how would I express such a list via the ${} placeholder notation? </p>