Line Chart Theme: X & Y axis

Hello All!

Trying to set the color in a JSON file for 'Color' property in X & Y axis for Line Chart. I can change the text size for each via the JSON file, so I know I'm in the appropriate card. 

Here is what I have in my JSON file for this visual:

"lineChart":{
            "*":{
                "categoryAxis":[{
                    "show": true,
                    "axisType": "Categorical",
                    "fontColorPrimary": "#FFFFFF",
                    "fontSize": 8,
                    "fontFamily": "Segoe UI",
                    "concatenateLabels": false,
                    "showAxisTitle": true
                }],
                "valueAxis":[{
                    "show": true,
                    "position": "Left",
                    "axisScale": "linear",
                    "showAxisTitle": false,
                    "labelColor": "#000000",
                    "fontFamily": "Segoe UI",
                    "fontSize": 10
                }],
                "labels":[{
                    "show": true
                }]
            }
        }

I've tried color, fontColor, primaryFontColor. Kind of at a loss. 

I've been using Curbal's PBI app for assistance with this (found HERE). 

Any idears?