As per https://learn.microsoft.com/en-us/azure/cosmos-db/choose-api#table-api
The Azure Cosmos DB API for Table stores data in key/value format.
Note that there are some differences though when compared with Azure Table Storage - for details, refer to https://learn.microsoft.com/en-us/azure/cosmos-db/table/faq#where-is-api-for-table-not-identical-with-azure-table-storage-behavior-
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hth
Marcin