title: How add variable npm run build in package.json
body: <p>I have 6 projects in an Angular workspace and I have to build each. Instead of write six lines in my package.json for each projet, for example : 
  "build_a":" npm run build a" 
  "buiild_b": "npm run build b"</p>
  
  <p>I would like to create only one line like this :</p>
  
  <p>"build_app": "npm run build name="aaa""</p>
  
  <p>How I can do it ?</p>