No, that is correct, you can't use those. However, Node-RED provides a notification utility for this purpose. I'll look it up and update this post when I find it.
RED.notify('Your message here', options)
- https://discourse.nodered.org/t/node-red-admin-ui-display-message-to-user/12290/2?u=totallyinformation
- https://github.com/node-red/node-red/blob/master/packages/node_modules/@node-red/editor-client/src/js/ui/notifications.js#L24
You will also find some examples in uibuilder's code.
Of course, in addition, you can put in-line help information in the configuration panel to help people understand how to input correct configurations.
