Simultaneous ottava and non-ottava voices

[Ahanu Banerjee]

Hi,

Is it possible to have two voices in one measure, on one staff, with one
voice as "Ottava 1" and the other as "Ottava 0"? (I realise this notation
may seem unclear, but I have a specific use case.)

If I try the following, each ottava overrides the other:

\version "2.23.10"
\relative c' {
  << { \ottava 1 \repeat unfold 4 c'' } \\ { \ottava 0 \repeat unfold 4 d,,
} >>
}

Thanks,
-Ahanu