@DanH found it in the LAF Docs: https://docs.hise.audio/glossary/custom_lookandfeel.html#getting-started
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();