Veera Mummidi - Thanks for the question and using MS Q&A platform.
Unfortunately, Azure Cosmos DB for MongoDB is not supported in Data flows.
As per the official documentation, here is the supported data stores.
Azure Data Factory and Azure Synapse Analytics pipelines support the following data stores and formats via Copy, Data Flow, Look up, Get Metadata, and Delete activities. Click each data store to learn the supported capabilities and the corresponding configurations in details.
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