Not really sure how to do this generally, though there is similar exame of free form input in the formbot example on github which requests a free form feedback from the user. Cheers!
@kxr123330 you need to overwrite slot_mapping method in your form action class as described here Slot Filling
for you case you should try something like
def slot_mappings(self):
‘’’
self.from_text(intent=intent_name) will use the next user utterance to fill the text slot slot_name
regardless of user intent if intent_name is None else only if user intent is intent_name.
‘’’
return {"slot_name ":[self.from_entity(entity="slot_name "), self.from_text()]}
@kxr123330 Intent=inform (or can be any other intent that you might have defined to handle this); story: this within the flow of your story form: inform{“customer_response”:“any text or empty”}; slot customer_response with type text or as applicable for your use case.