To show Picklist Field Values Dynamically in the Salesforce BOT, use Flow to fetch Picklist values from the Picklist Value Info Object and use it as the Dynamic choices in the Question Element.

1. Fetch Picklist field values using the Flow.

Get Records Element:

Loop Element Configuration:

Assignment Element Configuration:

List Text Variable:

2. Use Question element in the BOT to display as Dynamic Choices.

Output: