Creating a wildcard intent for all sentences?

Configuration Voice Assistant
2

It can be done in the HA config like so.
Sentence:

language: "en"
intents:
  AskTheRobot:
    data:
      - sentences:
          - "{question}"
lists:
  question:
    wildcard: true

Then for an intent script do the following:

AskTheRobot:
  action:
    - service: conversation.process
      data:
        agent_id: <your conversation agent id>
        text: '{{question}}'
        language: en
      response_variable: answer
    - stop: ""
      response_variable: answer
  speech:
    text: "{{ action_response.response.speech.plain.speech }}"

This worked for me when I tested it just now. Not sure if this will help you since I don’t use Node Red and never have, but this at least works in HA.