Using Arcade to get color in renderer

[KennethKahl-Bappert]

Hi,

I'm using ArcGIS REST Api Version 10.6.1.

I'm trying to get the color in the render out of the features in the feature layer.

A feature could look like this:

{
	"attributes": {
		"objectId": 31,
		"shortText": "Some text",
		"description1": "SampleDescription",
		"type": "LINE",
		"color": "[114,140,114,100]"
	},
	"geometry": {
		...
	}
}

In my renderer I'm trying to excess the field 'color' with an arcade expression:

"drawingInfo": {
		"renderer": {
			"type": "uniqueValue",
			"field1": "type",
			"uniqueValueInfos": [
				{
					"value": "LINE",
					"symbol": {
						"type": "esriSLS",
						"style": "esriSLSDot",
						"color": "$feature.color",
						"width": 1
					}
				}
			]
		},
		"transparency": 0
	}

It doesn't work!

Is it possible to get the value for the color in the renderer out of the feature in such a way?

Or do I need another approach?

Thanks for any help!

Ken