Objects hierarchy based on diagram objects positioning

[Tafros]

Hi,
I have a diagram with objects positioning, I need to set a parent-child hierarchy in the Project browser accordingly. Do we have any quick step to achieve object hierarchy based on diagram object positioning?
Example:
Have an activity inside a BPMN lane in the diagram, I assume activity is the child of the lane, as per diagram representation. I want to achieve the same representation in the project browser programmatically not manually.

Thanks in advance.