Unfortunately, multidimensional info like "time", "elevation", "band", etc., was originally supported in 10.x versions, but not in the 100.x Runtime SDK. See a similar post at here.
We are aware of this request and evaluating the importance of OGC WMTS spec conformance, and it would probably go into one of the 2023 releases of 200.x version of the SDK. Thanks for your patience.