Template view should point to extra variables available for specific templates
Template view today shows some $variables
that will be replaced by Core when sending out emails. However, this list is not complete and doesn't include the ones that are specific to only some templates.
It would be nice if the users can be pointed to the Core's documentation for those variables: https://mailman.readthedocs.io/en/latest/src/mailman/rest/docs/templates.html#templated-texts