The Job system allows Jinja templates but the UI doesn't

[wgresshoff]

Package version (if known): v0.3.0

Describe the bug

The "default arguments" component in the administrations "Job Edit" view will only accept Json content. There is Jinja templating support for this in the job system which is blocked by this in the UI.

Steps to Reproduce

1. Create a new Job.
2. Add a title.
3. Choose "Default" queue.
4. Choose task: invenio_vocabularies.services.tasks.process_datastream
5. Add this to default args:
   {"config":{"readers":[{"args":{"set":"authorities:sachbegriff","verb":"ListRecords","base_url":"https://services.dnb.de/oai/repository","from_date":"2024-06-01T00:00:00Z","until_date":"2024-06-10T00:00:00Z","metadata_prefix":"MARC21-xml"},"type":"oai-pmh"}],"writers":[{"args":{"identity":{{ system_identity }}},"type":"subjects-service"}],"transformers":[{"type":"gndsubjects"}]}}
6. Press "Save" button.

Expected behavior

Job is saved.

Screenshots (if applicable)

Additional context

This special job should run every 10 minutes with "from_date" and "until_date" adjusted accordingly, which should be generally possible with Jinja templates.