Example
[{"sku":"SKU999","periods":[{"period_start_date":"2020-01-01T00:00:00Z","sold_qty":8},{"period_start_date":"2020-02-01T00:00:00Z","sold_qty":2}]},{"sku":"SKU888","periods":[{"period_start_date":"2020-01-01T00:00:00Z","sold_qty":1},{"period_start_date":"2020-03-01T00:00:00Z","sold_qty":8}]}]