To retrieves all the issues where Secure Form is submitted you can use Secure Form issue Property with JQL.
This issue Property works fine with JQL Queries.
issue.property[SecureForm].Status ~ 'submitted'
In JQL, you can run above query with any JQL query, and it will return all issues where secure form is submitted and have a property with SecureForm status=submitted.
Example: If you want to filter out all the issues that is created today and have Secure Form Submitted then this JQL Query can help you.
