How to submit "Submission" or workflow using APIs(Documentation too short)

Hi Team,

I need your help to guide me as how to trigger submission using APIs.

I do understand there is "Create a submission" API as "POST /api/workspaces/{workspaceNamespace}/{workspaceName}/submissions" but somehow I'm not able to get as what to write in "submission" field?
Do we need to write method name only? then where to provide "Sample" to perform the analysis? Please provide some sample to trigger analysis if possible.

Regards