Entity that can contain any string

What is everyone doing to fill entity objects with ANY string? This is equivalent to @sys.any in dialogflow. I have an intent that looks like this:

find reports that use the Item Count metric

I would like the object_name entity to take ANY string a user enters and then perform a search using a webhook. I cannot find a way to get this to work yet, it only takes strings that I’ve explicitly put in the training data. Any clues?

you can do this in a custom action, by setting the entity to tracker.latest_message. We’re also in the process of pushing a new version of forms, where you can also specify that kind of behaviour: https://github.com/RasaHQ/rasa_core/pull/1013