How to get few columns from one Fields Parameter?

[Atoleto]

I have few tables ('Oblast' and 'District') with columns named 'Name' and 'shapeID'.
I use 'shapeID' column to identify shape at Mapbox custom visual, and need to build a chart based on 'Name' column.

How can I get these two values from the one Fields Parameter slicer?

My Fields Parameter:

LocationSelector = {
    ("District", NAMEOF('District'[shapeID]), 0),
    ("Oblast", NAMEOF('Oblast'[shapeID]), 1)
}

If I try to make a new column, like the next, it returns just a text value:

LocationName = if(LocationSelector[LocationSelector]="District", NAMEOF('District'[Name]),
         if(LocationSelector[LocationSelector]="Oblast", NAMEOF('Oblast'[Name])))

[amitchandak]

@Atoleto , Not very clear. But this how you get selected value of field parameter, Assume name is parameter

Selected Parameter = maxx(filter(Parameter ,Parameter[Parameter Order] = SELECTEDVALUE(Parameter[Parameter Order])), Parameter[Parameter])