Bot API 400 when migrating Zendesk deflection content

Is it possible to programmatically import Zendesk Guide articles into Genesys Cloud Bot deflection without hitting a 400 Bad Request? We are mapping Zendesk tickets to GC interactions. The validation fails on the knowledgeSource field.

botConfig:
 deflection:
 enabled: true
 source: zendesk_guide

Error: Invalid knowledge source type. How should we structure the payload to mimic Zendesk’s article hierarchy?