as it's not possible to write DAX formula into the Service WEB GUI, is that possible to write DAX queries somewhere else but querying powerbi online service ? (ex: from excel sheet, connected to the BI Service through the .odc "analyse in Excel" connection)
Analyze in excel. Populate something in the values area. Double-click to create a drilldown table. Right-click and change that table's query to the dax query you want.
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