Thanks for the great tool. I'm currently trying to implement custom slide numbering (the title page and overview should not count and horizontal and vertical slides should be displayed specifically). With the option to set a custom generator, it works great (as mentioned in https://revealjs.com/slide-numbers/). Unfortunately, I had to adapt the Pandoc template and lose some quarto possibilities. Is there an easier / better way to set a custom slide number generator?

I want to specify something like this instead of `slideNumber: 'c/t'`: 

```
 slideNumber: slide => {
              return [ '<span>' + (Reveal.getIndices( slide ).h - 1) + '</span><span>[' + (Reveal.getIndices( slide ).v + 1) + ']</span>'];
        }
```
2022-04-05T07:30:06Z
inventionate
Future
open
Curstom slide numbers
https://github.com/quarto-dev/quarto-cli/issues/530