Add a transition function (postfunction, validator, or condition type) to a workflow transition. Function configuration values can be provide using multiple field parameters (name=values) or a JSON representation using the data parameter. Make sure to provide all the fields required by the specific function being added. Field names and values usually have to be discovered by looking at request parameters used when adding the function in the UI or by someone who has provided an example for the specific function you are using. Use '--transition @create --step @create' to add functions to the create issue transition.