Vicent-Philippe Lauzon makes an announcement:
We recently made our new Kusto data connection available in public preview: Cosmos DB to Azure Data Explorer Synapse Link.
This does look like a marketing-heavy announcement but the short version is that you can ingest data from Cosmos DB into Data Explorer pools via Synapse Link rather than creating your own ETL process. The previous Cosmos DB connector for Synapse Link tied to a dedicated SQL pool.