One possibility is to use a third voice marked \voiceTwo.
You'll get some warnings about colliding note columns which you can safely
ignore.
\relative c'
{
\time 2/4
\key des \major
\clef F
<<
{ r4 ges | as ges | f2 } \\
{ \tweak Stem #'length #7 des2( | as)~ | as } \\
{ \voiceTwo des,2~ | des~ | des }
>>
}
HTH,
Tao
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