|Help Request| How can we get element chain

[yahyakara]

Hi thanks for this libary helps us to automate mobile application tests, Could you help me to know how can get element chan for example :
------key:element_1
----------key:sub_element
------key:element_2
----------key:sub_element
I need to know how can I pick the sub element of element_1

Should I change the key value pattern and change their value as "element". If I change the value parent Can Is there any method to use for getting elements by index ?

Thanks a lot in advance