Angular Bootstrap Charts - how to properly fill [colors] arr

*_Expected behavior_*I want to be able to change the colors of a Bootstrap Doughnut chart in my Angular web application. The documentation says that [colors] should point to an object or array in the typescript component.

html:

<canvas baseChart height="180px" [data]="doughnutChartData" [labels]="doughnutChartLabels" 
    [chartType]="doughnutChartType" (chartHover)="chartHovered($event)" (chartClick)="chartClicked($event)"
    **[colors]="chartColors"**>
    </canvas>

I followed an example color array from "lineChartColors" that I found in SB Admin Bootstrap Angular 6 demo application:

typescript

public chartColors: Array<any> = [
    {
        // grey
        backgroundColor: 'rgba(148,159,177,0.2)',
        borderColor: 'rgba(148,159,177,1)',
        pointBackgroundColor: 'rgba(148,159,177,1)',
        pointBorderColor: '#fff',
        pointHoverBackgroundColor: '#fff',
        pointHoverBorderColor: 'rgba(148,159,177,0.8)'
    },
    {
        // green
        backgroundColor: 'rgba(52,172,48,0.2)',
        borderColor: 'rgba(77,83,96,1)',
        pointBackgroundColor: 'rgba(52,172,48,0.2)',
        pointBorderColor: '#fff',
        pointHoverBackgroundColor: '#fff',
        pointHoverBorderColor: 'rgba(77,83,96,1)'
    },
    {
        // yellow
        backgroundColor: 'rgba(255,255,92,0.2)',
        borderColor: 'rgba(148,159,177,1)',
        pointBackgroundColor: 'rgba(255,255,92,0.2)',
        pointBorderColor: '#fff',
        pointHoverBackgroundColor: '#fff',
        pointHoverBorderColor: 'rgba(148,159,177,0.8)'
    },
        // red
        backgroundColor: 'rgba(216,40,10,0.2)',
        borderColor: 'rgba(148,159,177,1)',
        pointBackgroundColor: 'rgba(216,40,10,0.2)',
        pointBorderColor: '#fff',
        pointHoverBackgroundColor: '#fff',
        pointHoverBorderColor: 'rgba(148,159,177,0.8)'
    }
];

*_Actual behavior_*

No matter how much I tweak the colors, the doughnut chart populates in just a single color. Is there something wrong in my formatting? I couldn't find a shred of documentation on how to fill the color array anywhere. Any help is appreciated.