export class AppComponent implements OnInit {
builds$: Observable<BuildInfo[]>;
ngOnInit(): void {
    this.builds$ = this.buildService.builds$;
    this.buildService.loadAll();
    ...
}}

.dashboard
.mobile
    .build(*ngFor="let build of (builds$ | async | buildsByGroupFilter:'mobile')")
     | {{build.baseInfo.id}} - {{build.baseInfo.name}} - {{build.status}}

export class BuildsByGroupFilterPipe implements PipeTransform {
transform(items: BuildInfo[],  arg: string) {
    return items.filter(item => item.baseInfo.group === arg);
}