[Documentation is being written, not ready yet) You must have a .json file that matches the task ID. It has a name property which is nuxeo-{theTaskId}, a “layout” object that contains the variables to expose.

So go to “Resources” tab, then workflow > YourWorkflow. You must have on json file per task, naming convention is nuxeo-{taskid}-layout.json. You can get the id of the task by opening the corresponding .html (if you configured it in “LAYOUTS”), or by going to Modeler and looking at the task info. Say the task ID in our example is task123. You must create the nuxeo-task123-layout.json, here is an example with a “comment” variable:

{
  "name": "nuxeo-task123",
  "layout": [
    {
      "metadata": [
        {
          "label": "My Comment",
          "field": "comment",
          "type": "textarea"
        }
      ]
    }
  ]
}