### Bug description

Hi,

First of all, thanks for working so hard, Quarto is awesome!
I am generating docx report from R and I have to insert a signature page with a very specific format.
Previously, I was using Rmarkdown and officedown to generate my reports. The following code in the .Rmd allowed me to insert an external docx file (2 pages): 

```
<!---BLOCK_POUR_DOCX{file: 'templates/TitleAndSignaturePages.docx'}--->
```

That doesn't work with Quarto (expected). Would it be possible to add this functionality?

Thanks,

Thomas.

### Checklist

- [X] Please include a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
- [X] Please [format your issue](https://quarto.org/bug-reports.html#formatting-make-githubs-markdown-work-for-us) so it is easier for us to read the bug report.
- [X] Please document the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
- [X] Please document the operating system you're running. If on Linux, please provide the specific distribution.
cscheid
2023-01-30T15:03:18Z
tdemarchin
enhancement docx
v1.4
open
[Feature request] possibility to include an external docx document into the quarto docx report
https://github.com/quarto-dev/quarto-cli/issues/4148