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