Adding fingerings to chords

Fingerings for chords can be obtained by adding them to individual pitches.

\version "2.24.0"

%% http://lsr.di.unimi.it/LSR/Item?id=416

\paper { tagline = ##f }

\relative c'{
  < c-1 e-2 g-3 b-5 >2
  < d-1 f-2 a-3 c-5 >
}