1. Create a Collection variable in Einstein Bot builder. Use [System]Object and make sure to select Contains List.
2. Add Question in the Dialog and use Dynamic choice with input from the Collection Variable.
3. Create an Output variable in Flow as List of object.
4. Create an Input variable in Flow as text for a message to send it to the Bot from flow.
5. Create an Input variable in flow as text to get input from Bot in Flow.
Flow Configuration:
Bot Configuration:
Output: