@Hugo P Yes, I do not see this is supported via the SDK. Since, these features of language service are still supported by text analytics SDK client
The client language API version that is uses is 2023-04-01
See here for reference.
The REST API version that is used in the portal is 2024-11-01 GA or the next preview version. So, this option will be available through REST API calls if you use the API version 2024-11-01 or above.
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