How can I change the label font-size of an Angular mat-checkbox component?

I'm attempting to change the fontsize of mat-checkbox's label. Nothing I seem to attempt works as it's consistently being overriden by the component's default styles:

1. !important
2. ::ng-deep
3. Setting global style in styles.scss

<mat-checkbox [(ngModel)]="reportOption.AllSelected" *ngIf="reportOption.SelectAll" (change)="onSelectAllChange($event, reportOption)" style="margin-left:5px;" class="custom-checkbox">Select All</mat-checkbox>

Example problem

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