New Bangle.js 2 menu system

Another option: maybe support format on functions:

      // L295: changed from
      //   } else if ("function" == typeof item) {
     //        g.drawImage(/* 9x18 */atob("CRKBAGA4Hg8DwPB4HgcDg8PB4eHg8HAw­AA=="), r.x+r.w-21, r.y+H/2-9);
     //        pad += 16;
      } else if ("function" == typeof item && item.format) {
        var l=item.format(item.value);
        g.setFontAlign(1,0).drawString(l,r.x+r.w­-8,r.y+H/2);
        pad += g.stringWidth(l);
      }
...
var mainmenu = {
...
  "A menu item" : function() { LED1.toggle(); },
  "Submenu" : function() { E.showMenu(submenu); },
...
};
mainmenu.Submenu.format= ()=>'\0'+atob("CRKBAGA4Hg8DwPB4HgcDg8PB4­eHg8HAwAA==");

Sadly this means you can't just use a single object as menu definition :-(

Edit: or how about we just look if the label ends with ">"? It would require app changes, but nothing breaking.