It works on my german layout keyboard, but you could also use Insert -> Inline Free-form Input
The "Insert > Inline Free-form Input" operation is missing from Mathematica Online ( https://mathematica.wolframcloud.com/app ). What can I do?
Thx again Karsten for the hint with Insert-Menu!
I tried to switch my keyboard-layout to german, but it doesnt work for me. But its not a big Problem, with the "Insert-Menu" I have now an alternative way, if I need this feature.