How to use the @scion/workbench-application-platform.api.ManifestCommands.UnregisterCapability function in @scion/workbench-application-platform

public unregisterCapability$(type: string, qualifier?: Qualifier): Observable {
    const intentMessage: ManifestRegistryIntentMessages.UnregisterCapability = {
      type: PlatformCapabilityTypes.ManifestRegistry,
      qualifier: NilQualifier,
      payload: {
        command: ManifestCommands.UnregisterCapability,
        type: type,
        qualifier: qualifier,
      },
    };

    return Platform.getService(MessageBus).requestReceive$({channel: 'intent', message: intentMessage}, {once: true})
      .pipe(
        extractMessage(null),
        mergeMap(reply => {
          const success = reply && reply.status === 'ok';
          return success ? EMPTY : throwError(reply.message);
        }));
  }

this.queryCapabilityConsumers(envelope as MessageEnvelope);
        break;
      }
      case ManifestCommands.FindCapability: {
        this.queryCapability(envelope as MessageEnvelope);
        break;
      }
      case ManifestCommands.FindCapabilities: {
        this.queryCapabilities(envelope as MessageEnvelope);
        break;
      }
      case ManifestCommands.RegisterCapability: {
        this.registerCapability(envelope as MessageEnvelope);
        break;
      }
      case ManifestCommands.UnregisterCapability: {
        this.unregisterCapability(envelope as MessageEnvelope);
        break;
      }
      default: {
        this._logger.error(`[UnsupportedQueryError] Command not supported [command=${command}]`);
        this._messageBus.publishReply(null, envelope.sender, envelope.replyToUid);
      }
    }
  }