since 29.June.2017 now there is a big letter for ß
you can create it via html-entity: ẞ
and because bord soft will directly turn to the sign it is the &
and behind the #7838;
for those who are interested – https://www.typografie.info/3/wiki.html/v/grosses-eszett/
I’m not a friend of that too – but there are arguments for that to use