Feature disparity beween Tower GUI and tower-cli regarding workflow schema

[aboukhal]

Setup:
I have a job template in Ansible Tower with:

• name: foobar
• inventory: [prompt on launch]
• credential: [prompt on launch], cred1, cred 2
• survey: asking for VERSION

Ansible Tower GUI:
I can create a workflow, add the job template "foobar" to it, select only credentials "cred3" and "cred4", fill out the survey VERSION and save it all in that workflow.

Expectation:
I can do the same with tower-cli workflow schema.

Actual result:
It seems only possible to add the inventory and a single credential to the workflow_job via cli. That credential doesn't even replace the default credentials ("cred1", "cred2") of the template, but extends them. It is not possible to fill out the survey VERSION via cli, as well as any other prompts.

In case this functionality does exist and I was just unable to identify it from the Python code, please extend the documentation accordingly.