How to render boolean true in j2 file?

[Neil Young]

I'm not entirely sure if this is a YAML problem or an Ansible thing.

Trying to render a configuration json file from a j2 template.

Template.j2

{

  "test": {{ boolean_test }}

}

default.yml:

boolean_test: true

Result:

{

  "test": True

}

The result makes my node app complain (invalid json)

How to render 

{

  "test": true

}

?

[Neil Young]

Found it:

default.yml:

boolean_test: !!str true