@Soham Rajeshbhai Soneji Its a good question. Below is an update from our team on this query.
TSI Gen2 stores the data on customer's storage account that they can access Storage overview - Azure Time Series Insights Gen2 | Microsoft Learn. TSI Gen2 doesn't have capability to bulk import data, so you would need to ingest it again through Hubs.
Note: Don't delete your Azure Time Series Insights Gen2 files. Manage related data from within Azure Time Series Insights Gen2 only.
Hope this helps. Do let us know if you have any other queries.
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