Vertex AI Agent route to Dialogflow CX flow

[andmaj]

Hey, I'd like to have a Vertex AI Agent which routes some messages to Dialogflow CX flow.

According to the documentation (here and here), it should be possible.

Example:

- greet the customer and ask them how you can help.
- help the customer to pay for their booking by routing them to ${FLOW: make_payment}.

Unfortunately, I couldn't find any examples supporting this and Google and I'm not able to use the FLOW type in the instructions.