title: defining new variable within jquery template
body: <p>Is it possible to define a new variable within a jquery template?
  I read the official jquery template docs but could not find anything on this.
  I tried something like <code>{{ var xxx=123 }}</code> but it didn't work.
  Finally I am using a hack by doing </p>
  
  <p><code>${$item.xxx=123,""}</code></p>
  
  <p>and later using </p>
  
  <p><code>$item.xxx</code></p>
  
  <p>but I am sure it is not the best approach...</p>