// Add Source
val options = GeoJsonOptions().withCluster(true).withClusterRadius(30)
val stopSource = GeoJsonSource(sourceId, collection, options)
style.addSource(stopSource)

// Add single layer
val singleLayer = SymbolLayer(singleLayerId, sourceId).apply {
                       withProperties(
                           PropertyFactory.iconImage(singleLayerId),
                           PropertyFactory.iconAllowOverlap(true)
                       )
                   }

style.addImage(singleLayerId, singleIcon)
style.addLayer(singleLayer)


// Add cluster layer
val clusterLayer = SymbolLayer(clusterLayerId, sourceId).apply {

                       setFilter(eq(get("cluster"), true))

                       withProperties(
                           PropertyFactory.iconImage(clusterLayerId),
                           PropertyFactory.iconAllowOverlap(true)
                       )
                   }

style.addImage(clusterLayerId, clusterIcon)
style.addLayer(clusterLayer)