openlayers - How to define styles for features in JSON file

Styles for rendering features in OpenLayers 3 are defined as:

new ol.style.Style({
  image: new ol.style.Circle({
    radius: 6,
    stroke: new ol.style.Stroke({
      color: 'white',
      width: 2
    }),
    fill: new ol.style.Fill({

      color: 'green'
    })
  })
})

I would like to define my styles in JSON file, not in code. Is there any way how to load styles from JSON? I could easily load attributes like "color" : "green", but I cannot load something like new ol.style.Fill...