API: Convert Issue to task (convertToTask)

Hello,

I want to convert an issue to a task using the API. Therefore I found the action "convertToTask". But using this leads to a different behaviour than using "Convert to task" on an issue directly in Workfront.

I am using a custom form on the issue which is also available for tasks. I would like to attach the form to the created task as well what works, if I add the parameter "categoryID". But is it also somehow possible to keep all values entered into the custom form?

Or is it meant that these have to be inserted again manually afterwards? What exactly does the API function "convertToTask" do if no data is transferred from the issue?

Does anybody have any experiences with converting issues to tasks or projects using the API?

Regards

Lars