How can I make shiny-app appear on search engine?

I would also be interested in an answer!

We recently had another discussion, to what extent search engines are able to visit sites at shinyapps.io. App deployed to shinyappsio keeps waking up with no user connection

So far it seems nobody really knows?!
However, when I search for my username in combination with the app-name (the parts before and after shinyapps.io) nothing is found, although the app is online for 9 months or so.

I think it would be awesome if it would be possible to upload a file together with the app that is loaded before the app even starts, telling the crawlers what they could find there, or on the other hand if they should move on and there is nothing of interest for them.

I mean something like the robots.txt or sitemaps. Just containing the name of the app, the name of the author and maybe a short description or a few keywords.

R-Studio developers, is this possible?