We have a use case for low latency solutions to power our custom dashboard and leverage the BI engine.
I could see that the BI engine is enabled only for Data Studio and Looker.
Is there any solution to integrate a BigQuery BI engine to BigQuery Client?
There is no registration for BI Engine coupled with Looker or Datastudio. But, to access to the SQL interface, you must be registered.
Here the link in the documentation