How to parameterize a column for aggregation

I have users who would like to be able to modify what columns a table aggregates by. My issue is that I seem unable to do this in Power BI. I basically want to be able to do the following in SQL:

SELECT
    <OrgLevel1>,
    <OrgLevel2>,
    SUM([Revenue])
FROM [Data]
GROUP BY
    <OrgLevel1>,
    <OrgLevel2>
;

where the user can change `<OrgLevel1>` and/or `<OrgLevel2>` to be any of { "(All)", [Department], [Product] }.

The issue may be related to this post: https://community.powerbi.com/t5/Desktop/Calculated-Column-Table-Change-Dynamically-According-to-Slicer/m-p/655991#M314800

Here's a link to a workbook that illustrates this issue, TestParameterizeGroupby.pbix (hosted by Google Drive). I've also included field definitions below with screenshots. Thanks for any help.

TestParameterizeGroupby.pbix:

Link: TestParameterizeGroupby.pbix (hosted by Google Drive)

Problem:

[Org Level 1] and [Org Level 2] fields are not recalculating from the users' selection. Only the default values are shown.

Expected result in table:

"Org Level 1","Org Level 2", "Revenue"
"(All)","(All)",28

Note:

The purpose is to have parameterizable organization level fields so that the report user can aggregate by all, department, product, or both in either order.

Table and column definitions:

'Data' = DATATABLE(
    "Department",
    STRING,
    "Product",
    STRING,
    "Revenue",
    DOUBLE,
    {
        {"DeptA", "ProdX", 5.0},
        {"DeptA", "ProdY", 6.0},
        {"DeptB", "ProdX", 10.0},
        {"DeptB", "ProdY", 7.0}
    }
)

'Data'[Org Level 1] = SWITCH(
    'Org Level 1 Parameter'[Org Level 1 Parameter Value],
    0,
    "(All)",
    1,
    [Department],
    2,
    [Product]
)
// Problem: [Org Level 1] and [Org Level 2] fields are not recalculating from the users' selection. Only the default values are shown.

'Org Level 1' = DATATABLE(
    "Org Level 1",
    STRING,
    "Org Level 1 Parameter",
    INTEGER,
    {
        {"(0) (All)", 0},
        {"(1) Department", 1},
        {"(2) Product", 2}
    }
)

'Org Level 1 Parameter'[Org Level 1 Parameter] = GENERATESERIES(0, 2, 1)
'Org Level 1 Parameter'[Org Level 1 Parameter Value] = SELECTEDVALUE('Org Level 1 Parameter'[Org Level 1 Parameter], 1)

Table 'Org Level 1' has a 1-1 relationship with 'Org Level 1 Parameter' on column [Org Level 1 Parameter].

The user selects the value for 'Data'[Org Level 1] by selecting the value for 'Org Level 1'[Org Level 1].

Tables and columns for [Org Level 2] are defined in the same way as [Org Level 1].

Screenshots:

Report:

Report

Data:

Data

Model:

Model

Cross-reference to post in Stack Overflow: https://stackoverflow.com/questions/59686829/how-to-parameterize-a-column-for-aggregation-in-power-bi-desktop