Insert a css or js file in a manifest stored in a page variable

I'd like to define a specific css for a single included page in this way


---
layout: default.html
css: page.css.scss

---
My customized page

and in my layout page I'd like to add this custom css like so

<!-- layout style -->
{% css_asset_tag global %} 
- /_assets/css/test.css.scss   <-- this works correctly
 {% endcss_asset_tag %}

<!-- page style -->
/_assets/css/{{ page.css }} <-- this correctly print /_assets/css/page.css.scss

{% if page.css %}
    {% css_asset_tag local %}
- /_assets/css/{{ page.css }}  <-- this fails
    {% endcss_asset_tag %}
{% endif %}

but when I run jekyll I've got an error:

Configuration from /Users/fcalderan/www/root/jekyll/_config.yml
Building site: ./src -> ./static
Asset Pipeline: Processing 'css_asset_tag' manifest 'global'
Configuration from /Users/fcalderan/www/root/jekyll/_config.yml
Configuration from /Users/fcalderan/www/root/jekyll/_config.yml
Asset Pipeline: Saved 'test.css' to '/Users/fcalderan/www/root/jekyll/static/css'
Asset Pipeline: Processing 'css_asset_tag' manifest 'local'
Asset Pipeline: Failed to load assets from provided manifest.
Liquid Exception: Is a directory - /Users/fcalderan/www/root/jekyll/src/_assets/css/ in default
...

I'm not sure but I suppose the interpolation of the string with the css filename is failing inside {% css_asset_tag %} block. There's a way to include a custom style or is it not possible? Or there's a better way to achieve the same result?

Thank you.

matthodan / jekyll-asset-pipeline

Insert a css or js file in a manifest stored in a page variable #18