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multi dimension structure to flat structure


I'm pulling a report API that returns a multi-dimension JSON structure I'm not entirely sure how to handle in Power BI;

Source data;


I can convert that to a table, transpose the data, promote the first row to column headers and then expand "column_definitions" so I end up with this;



"Column_definitions" contains records with the values I want as my headers, and "Row_values" contains a list with corresponding values to those headers.

How do I move forward to get this into a single flat table structure? 


Something like (new custom step):  


#table(Record.FieldNames(PreviousStep[column_definitions]), PreviousStep[row_values])



This may depend on the format of column_definintions.


PreviousStep is the previous step in the query

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