Method 1: drills into nested json objects and arrays and returns the key names as headers, key values as rows. In cases with multiple nested values, they get returned into multiple columns, differentiated by a number, e.g. orders > products > 1, orders > products > 2.
Method 2: same as above but returns all nested data into a single column, e.g. a single column named orders > products. This can break the association between JSON elements, but is more convenient for certain types of analysis.
Method 3: concatenates all the elements of each nested object into a single cell, separated with pipes.
In some cases (e.g. when the primary object of interest is nested inside another object) there are still problems recognizing what keys should represent rows vs columns, but in my tests the above 3 algorithms cover most of the use cases for spreadsheets.
[1] https://mixedanalytics.com/knowledge-base/report-styles/