Sharepoint Online Add App from Store with CSOM

Hello everyone!

I want to install an App to the Web using CSOM.

But this app is from Store, not from my custom App Catalog.

So when I load AppManager

			var web = mainContext.Web;
			var appManager = new AppManager(mainContext);
			var apps = appManager.GetAvailable();

I can see all instances from my tenant appcatalog.
And I do not see this Templafy app 

Same for /_api/web/tenantappcatalog/AvailableApps

It does not exist there.

So is there no way to add this app from the csom?

kind regards,

Rafael