@mehmethand you can combine laf + images :
const knobImage = Content.createLocalLookAndFeel();
knobImage.loadImage("{PROJECT_FOLDER}image.png", "img");
knobImage.registerFunction("drawRotarySlider", function(g, obj)
{
var a = obj.area;
var offset = 100.0; // size of 1 image in px
g.drawImage("img", a, 0, Engine.doubleToString(obj.value*100.0*offset, 2));
});
Although it only works with linear values. If you use non-linear knob modes, it gets messed up.