[Enhancement] Ability to read and manipulate data from JSON and YAML files

[vitto4]

Before submitting

• I am using the latest version of Quarkdown.
• I have checked the wiki to confirm this feature doesn't already exist.
• I have searched existing issues for duplicates.

Description

Something like this maybe ?

.var {foo}
    .json {assets/foo.json}

.var {bar}
    .yaml {assets/bar.yaml}

These functions could return a dictionary-like object.

Proposed syntax or behavior

Additional context

No response