Send fetch task on onInstallationUpdateAdd

Hi,

I'm working on onboarding experience for my bot and want to add several steps once app is added.

I currently send this prompt that invokes activity and shows the dialog. However I can't find a way to trigger task/fetch without user clicking on a button. Is it possible to force fetch so that user is presented with dialog?

Thank you

this.onInstallationUpdateAdd(async (context, next) => {
      // This method is triggered when app is installed
      console.log('onInstallationUpdateAdd', this.dialogState);
      
      const installCard = CardFactory.heroCard(
        'Install App',
        null,
        [{
          type: 'invoke',
          title: 'Install',
          value: {
            type: 'task/fetch',
            install: true
          }
        }]);

      await context.sendActivity({ attachments: [installCard] });
      
      await next();
    });