Workbench Question - Max of Metric ?

Hi everyone, hoping someone can help as I can't find an answer to this one.

we have 'total(Metric)' which is great for getting the total of a Metric but I wondered if the same exists for Maximum i.e. 'max(Metric)', you can do which is the max of two different metrics but I want it to show the maximum of one specific metric. i want it to do something like :

[img]Max.PNG[/img]

is this possible within workbench ?

Thanks

Mark