c# - represent tree data structure with multiple parents whose parent path is stored in model

Question

I am trying to implement a organizational structure where one user can have more than one children users and parent users. Using cosmosDB as document database, I have stored the path of parent users in each user document.

Data Structure of user document

user1
path = null

user2
path = ["user1ID"]

user3
path = ["user2ID", "user1ID"]

user4
path = [["user1ID"], ["user3ID", "user2ID", "user1ID"]]

where path is List<List<string>>()

Problem: I wrote logic to update the paths of the users and find the flat list of ascendants and descendants of a user. The problem I am facing is to represent these list of users in hierarchy.

Output expected:

user1 -> 
        user2->
               user3->
                      user4
        user4

user2 -> 
        user3 ->
                user4

user3 -> 
        user4

user4 ->

In front-end, i am using JsTree library to show the user hierarchies.

I looked for many solutions regarding this but couldn't find the way i am looking for. Any help would be appreciated.