How to add multiple lines of text in GUI.Button with different font styles?

I have a GUI Button inside which I have to add texture, name and a description. I have managed to add the texture and name using GUIContent. How to add another text in the button with a different font size and color?

 var ballButtonContent : GUIContent = new GUIContent("  Ball", ballTexture); 
 
 if(GUI.Button(Rect(42,50,200,50), ballButtonContent))            
  {
 //doSomething;
 }

The font styles of the text are set in the GUISkin. Now if I do something like

 var ballButtonContent : GUIContent = new GUIContent("  Ball\n Description", ballTexture); 

Both Ball and Description will have same styles. How can I resolve this problem?