how to export data keeping branch structure information?

Hi!

I want to export the contents of list keeping the information of branch as shown in below image.

But when I export list, exported csv file lost the information of branch as attached csv file.

Does anyone know how to export list data keeping branch structure information?

Also, if anyone know how to export list data converting to 2d array according to tree structure, I would like to know.

Thank you for your help!

Katsuya