I would like to load an external yaml file in the yaml header of a qmd document (Quarto). I tried using !include <.yaml> in my yaml header as described here, but this doesn’t seem to work. First I create a yaml file called external_yaml.yaml:

author: Quinten
format: dashboard

Now I created a Quarto document called test_file.qmd like this:

---
!include external_yaml.yaml
title: "Yaml with external yaml"
---

# Tab

This is a test

This returns an error:

ERROR: YAMLError: test_file.qmd:
unknown tag !<!include> at line 3, column 6:
    title: "Yaml with external yaml"
         ^
Did you try to use a '!' in a YAML string? If so, you need to add explicit quotes to your string.

Stack trace:
unknown tag !<!include> at line 3, column 6:
    title: "Yaml with external yaml"
         ^
Did you try to use a '!' in a YAML string? If so, you need to add explicit quotes to your string.
    at generateError (file:///Applications/quarto/bin/quarto.js:10478:12)
    at throwError (file:///Applications/quarto/bin/quarto.js:10481:11)
    at composeNode (file:///Applications/quarto/bin/quarto.js:11348:20)
    at readDocument (file:///Applications/quarto/bin/quarto.js:11411:5)
    at loadDocuments (file:///Applications/quarto/bin/quarto.js:11446:9)
    at load (file:///Applications/quarto/bin/quarto.js:11451:23)
    at parse2 (file:///Applications/quarto/bin/quarto.js:11461:12)
    at parseWithNiceErrors (file:///Applications/quarto/bin/quarto.js:19693:16)
    at readYamlFromMarkdown (file:///Applications/quarto/bin/quarto.js:19624:17)
    at markdownExecutionEngine (file:///Applications/quarto/bin/quarto.js:41167:20)

So I was wondering if anyone knows how we could add an external file in a yaml header of a quarto document?