matrix-dimension/web/app/configs/widget/bigbluebutton/bigbluebutton.widget.component.html

<my-widget-config [widgetComponent]="this">
    <ng-template #widgetParamsTemplate let-widget="widget">
        <label class="label-block">
            {{'BigBlueButton Meeting URL' | translate}}
            <input type="text" class="form-control"
                   placeholder="https://bbb.example.com/abc-def-ghi"
                   [(ngModel)]="widget.dimension.newData.conferenceUrl" name="widget-url-{{widget.id}}"
                   [disabled]="isUpdating"/>
        </label>
    </ng-template>
</my-widget-config>