title: How to put multiple theme names in VSCode colorCustomization
body: <p>For colour customisation of any theme in VSCode we do it like this</p>
  
  <pre><code>"workbench.colorCustomizations": {
      "[Night Owl No Italics]": {
        "activityBar.background": "#000C1D",
        "activityBar.border": "#102a44",
        "sideBar.background": "#001122",
        "sideBar.border": "#102a44",
        "sideBar.foreground": "#8BADC1"
      },
  </code></pre>
  
  <p>How to add multiple name in the theme may be like <code>[Night Owl, Night Owl No Italics]</code> (This doesn't work). I don't want to repeat and define the same properties twice for two different themes. Is there any way to do this?</p>