How to access frontmatter data in liquid templates?

According to Middleman: Frontmatter, it is possible to access data defined in a page front matter inside ERB template under the variable. However, this variable is not defined inside a Liquid template.


title: Hello World!

<h1>{{ }}</h1>

yields an empty h1 tag.

Searching this problem, I found the issue #1202, but is seems to be about helper methods, which I believe to be a very different topic.

I also found Completed: Need Modules to allow exposing liquid variables. This one seems more relevant, but I don’t understand the solution. What is this page setting they are using? I see no mention about it in my http://localhost:4567/__middleman/config/.