Alias metrics by a label value

[ghost]

Use case : I want to display the traffic by campaignID ; so I use campaignID as the reducer and I get 10 series to display ; in the legend I want to name each metric with the campaignID value, but there is no way to do that with the "User friendly query builder".

To do this, I have to write it in Warpscipt and add :
<% DROP DUP LABELS 'campaignID' GET RENAME %> LMAP SORT

But Warpscript is less user friendly :-) and this is a very common use case ; in fact I do that for all graph panels.

Proposal : do it the same way than Prometheus with a field "Legend Format" where you can set exactly what you want to display ; {{campaignID}} means for example the value of the label campaignID