laf.registerFunction("drawNumberTag", function(g, obj)
{
    obj.area[0] += obj.area[2] - 16;
    obj.area[1] += 2;
    obj.area[2] = 14;
    obj.area[3] = 14;
    
    g.setColour(0x88000000);
    g.fillRoundedRectangle(obj.area, 4);
    g.setColour(Colours.white);
    g.drawRoundedRectangle(obj.area, 4, 2);
    
    var letters = ["A", "B", "C"];
    
    g.drawAlignedText(letters[obj.macroIndex], obj.area, "centred");
});

And make sure to put in the below as well

const var laf = Engine.createGlobalScriptLookAndFeel();