Because Catalog and Canvas data are linked, the {{fields}} data would be pulled from the Catalog course.
{{award_name}} = Catalog Course Listing Title
The certificate liquid generator currently seems to only support the five or so "commands" listed on the "Custom HTML/CSS" page of the Catalog certificate tab. Keep in mind that you can always replace {{award_name}} with whatever text you would like, and that will be statically generated on each certificate awarded.
For example, changing {{award_name}} to "Happy Birthday" would replace the course name on the certificate with "Happy Birthday" for every certificate generated. So your options to change that value are to either change the course title in Catalog, or define your own term in the certificate HTML.
Hope that helps!
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