title: Dynamic parameter based on previous string parameter
body: <p>In Jenkins I have a string parameter <em>HOST</em>. After this parameter I have a dynamic parameter <em>URL</em>. This parameter needs to be a concatenation of strings, including the previously defined <em>HOST</em> parameter.</p>
  
  <p>I have been unable to find out how to do this.</p>
  
  <p>The motivation for this is subsequent parameters will also use this <em>HOST</em> parameter.</p>