get a config defined variable for a collectionhttps://github.com/jekyll/jekyll/issues/4392#issuecomment-174369983

jekyll-collections-config-value.liquid

If I have a _config.yml with:

collections:
  my_collection:
    foo: bar

And a template with

```
  {% assign collectionName = 'my_collection' %}
    or
  {% assign collectionName = page.collection %}
  
  {% assign d = site.collections | where:'label',collectionName | first %}
  {{ d.foo }}
```

My output is, as expected:

bar