How to reference column names dynamically to change Y value in line graph?

[dd-edwin]

Hello,

I am working through the following tips and tricks video: https://youtu.be/i1kCHZEhnEY?t=1539 and have a question about dynamic metrics.

In his example, he is able to switch between Cost, Revenue, etc.

I want to add another slicer that will change the Y Axis values from one column to another.

Ex)
Average Type TableDashboardData Table

Quantity Type Table

selected_measure = 
    var temp_key = SWITCH(
            TRUE(),
            "Kit Quantity" IN ALLSELECTED(QuantityTypeTable[Quantity Type]), "Kit Quantity",
            "Unit Quantity" IN ALLSELECTED(QuantityTypeTable[Quantity Type]), "Unit Quantity",
            // Default
            "Kit Quantity"
    )

    RETURN
        SWITCH(
            TRUE(),
            SWITCH(
                TRUE(),
                "Actual" IN ALLSELECTED(AveragingTypeTable[Averaging Type]), CALCULATE(SUM('DataTable'[temp_key])),

                // Pretend the rolling average calculates the rolling average...
                "Rolling Average" IN ALLSELECTED(AveragingTypeTable[Averaging Type]), CALCULATE(SUM('DataTable'[temp_key])),
                CALCULATE(0)
            )
        )

I want to be able to use a dynamic column so that I can use one LINE GRAPH and switch between the kit/unit quantity and the type of Y values (based on averaging or actual values).

How do I make my calculation function dynamic such that it takes temp_key and uses that string as the column name in DataTable (for the red text)?

Thanks!