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This would be especially nice for providing a secret value in a pipeline activity. It seems the only way to do this is via a web activity (documented here: https://docs.microsoft.com/en-us/azure/data-factory/how-to-use-azure-key-vault-secrets-pipeline-activities).
This feels extremely clunky if you've already defined a Key Vault linked service. It would be great to just reference the Key Vault dynamically with a syntax like: @linkedService('key_vault_name').mySecret