Sorry, you're right. But the thing is that serverless compute does not support JAR file installatioQn, so you cannot use JDBC or ODBC drivers.
But with Databricks Apps you have ability to trigger Lakeflow Jobs. So you can create a job that will use classic compute and on that compute install ODBC driver. So the ingestion part of your app will be handled by classic compute job and then you can operate on result within an app using serverless compute

Best practices for serverless compute - Azure Databricks | Microsoft Learn