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Add a new advanced configuration option 'extraExportColumnsConfig' whose value will have the following pattern:
{"PLI":{"rm":["Margin %","Price","Quantity"]}}
where the first key can be PLI or XPLI (depending on for which entity type the configuration is intended) and its value is JSON, where the key is the name of the result matrix and the value is a list of strings which are the column names in the result matrix.
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