There is no such option so far. There should be different kind of aggregation for this. Issue may be as well refreshing those value because this need full dashboard refresh. If dashboard is large and refresh will be every 10 seconds in may not be able to fully load before next refresh.
This is nowadays possible with the Data explorer. You can make use of the Last value fold transformation in the Build mode. You can also make use of the :last operator in the Code mode.