Serverless Synapse SQL pool in Azure Synapse Analytics is a T-SQL query engine that enables you to read the files placed on Azure storage. You can easily integrate your Azure SQL engine with Synapse SQL to delegate big data analytics and analyze large amount of data placed on Azure.
Serverless Synapse SQL pool enables you to query files on Azure Data Lake Storage. Azure SQL Managed Instance can use linked servers to query data on Azure Storage using Synapse Analytics serverless SQL query endpoint. This technique linked server may be good solution for some Polybase-like scenarios.