Xray test executed filtering by Test Plan s Label

You would need the custom calculation to override the context as typically label would be linked to Issues not Test plan

 --filter set of Test plans
  DescendantsSet([Xray Test Plan].CurrentMember,[Xray Test Plan].[Plan]),
  --Test Plan issue has selected Label
   [Measures].[Issues created],
     [Xray Test Plan].CurrentMember.KEY),
  )) > 0 ),
 --sum up test executed runs ignoring Label assigned to Test Plan
 ([Measures].[Xray Tests executed],

A similar formula is on this communication post.

Martins / eazyBI