How do you change the points of interest icons (places) in google maps using android?

Question

Using Google's api, I understand how to change the style of a map but I can't figure out how to change the icon for a specific point of interest.

I want to change the icon for business using the JSON style:

{
\"featureType\": \"poi.business\",
\"elementType\": \"labels.icon\",
\"stylers\": [
  {
    \"visibility\": \"on\"
  }
]

}

but how do I set that icon to something else?