1.) if accidentals are used, then it should be Bb, not B
... Ab/G#, A, Bb/A#, H, C ...
That's
how chords in "German" note spelling are displayed in Musescore and my
preferred style whenever it is available. It's unambiguous and cannot be
confused. Finale, the ChordPro reference implementation and maybe others call it "Scandinavian"
2.) if you use B and H that's traditional German style
In that case the chords are
C, Cis/Des, D, Dis/Es, E, F, Fis/Ges, G, Gis/As, A, Ais/B, H, C
Still used in classical or traditional music.
Musescore calls that note spelling "Full German", Finale, the ChordPro reference implementation and maybe others call it "German"