ExcelRobot

/*
Name: Unpivot Table (UNPIVOT)
Description: Given a table range with headers and array of header names, unpivots the 
   specified columns in place, optionally removing any blank entries.
Written By: Excel Robot (@ExcelRobot)
Category: Array
*/
UNPIVOT=LAMBDA(table,[columns_to_unpivot],[attribute_name],[value_name],[remove_blanks], LET(
   _ColumnsToUnpivot, IF(
      ISOMITTED(columns_to_unpivot),