Chronicle does not currently provide a direct API ingestion method for HubSpot CRM audit logs. The available methods for ingesting HubSpot logs into Chronicle are non-API and Cloud Storage methods, as mentioned on the Chronicle Add Feed page.
However, it is worth noting that Chronicle supports ingesting logs from Cloud Storage. So, if you can find or develop an Integration Connector that can export the HubSpot CRM audit logs to a supported format (such as JSON or CSV) and store them in a Cloud Storage bucket, you can then configure Chronicle to ingest the logs from that Cloud Storage bucket.