According to this article, the german capital sharp s (ẞ) is official. (https://medium.com/@typefacts/the-german-capital-letter-eszett-e0936c1388f8)
Google's Roboto for Android is already supporting the ẞ: https://github.com/google/roboto/releases/tag/v2.138
But the according Web-Font isn't: https://fonts.google.com/specimen/Roboto
Is there a way to get the capital s into the web-font, or when is Google going to support it?