Since recent changes, which have removed the JSON preview from the Proforma editor and made updating form-based automations extremely difficult without pairing to Jira fields, this has become extremely important!
Any updates here appreciated, thanks.
Hello - this is now possible with Form field Smart Values. https://community.atlassian.com/t5/Jira-Service-Management-articles/New-Access-form-and-form-fields-with-smart-values-in-Jira/ba-p/2867412