Chart Color issue

[comsatsTaha]

trafficstars

$chartOptionsProvinceWise = [
        'chart_title' => 'Province Wise Applications',
        'report_type' => 'group_by_relationship',
        'model' => 'App\Models\Candidate',
        'relationship_name' => 'province',
        'group_by_field' => 'name',
        'chart_type' => 'pie',
        'chart_color ' => '255,0,0'
    ];

Chart_color not working in pie chart only working in bar chart and line chart