Deneb Vega-Lite Axis Label Font Color

Hi,

I have written the below code, but I am trying to make the font color on the X-Axis the same as the Title color. everything I have tried either makes the Title change, or produces an error (Validation: should NOT have additional properties of #/additionalProperties).

Can anyone help please?

Thank you

{
"title": {"text": "Average"},
"config": {
"view": {"stroke": "transparent"},
"font": "Pirenaica",
"title": {"fontSize": 30, "color":"#039d95"}},

"data": {"name": "dataset"},
"layer": [
{
"mark": {
"type": "area",
"interpolate": "step",
"tooltip": true,
"color": {
"x1": 1,
"y1": 1,
"y2": 0.5,
"gradient": "linear",
"stops": [
{
"offset": 0,
"color": "#039d95"
},
{
"offset": 1,
"color": "#E8580D"
}
]
}
}
}
],
"encoding": {
"x": {
"field": "durationtimeblock",
"type": "ordinal",
"sort": {"field": "durationsort"},
"title": null,
"axis": {"labelFont": "Pirenaica","labelFontSize": 8}

},

"y": {
"field": "Average of durationcount",
"type": "quantitative",
"axis": null
}
}
}