Create smooth scale

CesiumJS
1

Hey, everybody. I need to make smooth scaling for ImageMaterialProperty. Here is my code where I create Entity:

                                              let plane = new Entity({
						position: position,
						orientation: orientation,
						properties: {
							type: 'icon'
						},
						parent: airObj,
						name: 'Icon',
						plane: {
							show: true,
							plane: new Plane(Cartesian3.UNIT_Z, 0.0),
							dimensions: new Cartesian2(30000.0, 30000.0),
							material: new ImageMaterialProperty({
								image: airs,
								transparent: true,
							}),
                                                 }
					})

Thanks in advance for your advice and help!