How to update uvs on <Merged /> instances

[hatsumatsu]

Could you point me in the right direction how to update UVs on an instance when using <Merged />?

I tried various variations of this without success:

const modifiedUVs = [...];

<Merged meshes={nodes}>
        {({ Back, Front }) => (
          <>
            {Array(totalX)
              .fill()
              .map((_, x) => (
                <Front geometry-attributes-uv={modifiedUVs[x]} />
              ))}
          </>
        )}
</Merged>

Thanks!