Folder structure not kept

[salmiak]

I want the folder structure from my source folder (icons) to be kept in the destination folder (png). I've tried multiple settings but it puts all the output into one folder.

    "convert-svg-to-png": {
      png: {
        options: {
          size: {w: "512px", h: "512px"},
        },
        files: [{
          expand: true,
          cwd: "icons/",
          src: ["**/*.svg"],
          dest: "png/",
          flatten: false
        }]
      }
    }