BigQuery ML (BQ ML) integration in various tools and platforms can vary, and the level of support may change over time. Google Cloud and its associated services, including BigQuery ML, often receive updates and new features to meet user demands.
For seeking support, you can always file an issue or a feature request in the Issue Tracking System. You can also go through the "Buganizer" (if you have an access). Also, just by contacting Google Cloud Support can help you redirect with the people who can specifically help you in your BQ ML concerns.
Additionally, by posting here in Google Cloud Community or other forums like Stack Overflow could help you reach the people who might actually help you solve your use cases.