Problem in using Variable in __Mixed__ Datasource

i wanna have two metric from two different datasource with Mixed datasource.
problem is here i cant have variable in Query A and Query B as Datasorce.

what version of grafana?

what do you mean by the above?

My Grafana version is 9.0.2
as you know there is a datasource per Query.
i want use 2 different Datasource’s Metrics in one panel with DropDown Selection for Datasource as defined Variable($Datasource).
solution is using __Mixed Datasource.problem is while using __Mixied you cant use $Datasource as a Variable else in box QueryA ,B

i hope was cleared

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