Using callActionsController To Invoke HTML Actions
Your HTML-based action extension can invoke headless actions on its own initiative, by calling the JavaScript method WEB_PLATFORM.callActionsController(url, jsonData).
The value of url has the form /vsphere-client/chassis/rest/actions.html?actionUid=actionUid
The value of jsonData is a JSON map of parameters passed to the actions controller, or null if no parameters are needed.