label rendered over the billboard image

Hi. I need label rendered over the billboard image. For example numbers in the circle, where number - is a label, circle - is an image. Is it possible?

I’ve used that:

viewer.entities.add({

position: Cesium.Cartesian3.fromDegrees(center[0], center[1]),

label: {

text: ‘a’,

font: ‘12px sans-serif’,

horizontalOrigin: Cesium.HorizontalOrigin.CENTER,

pixelOffset: new Cesium.Cartesian2(0.0, -image.height),

fillColor: Cesium.Color.BLACK

},

billboard: {

image: image,

pixelOffset: new Cesium.Cartesian2(0.0, -image.height * 0.5),

}

});

Have you tried adjusting the eyeOffset.z?

http://cesiumjs.org/Cesium/Build/Documentation/Billboard.html has some examples of adjusting the labels