OptionalcolorColor is represented as a four-element array. The four elements represent values for red, green, blue, and alpha in that order. Values range from 0 through 255. If color is undefined for a symbol, the color value is null.
OptionaloutlineSets the outline of the fill symbol.
OptionalstyleThe fill style.
The type of symbol. See SymbolJsonType.
Simple fill symbols can be used to symbolize polygon geometries.
See https://developers.arcgis.com/web-map-specification/objects/esriSFS_symbol/.