Azure Python how to link child/related tickets to an already created ticket?

Commencez par azure-devops/azure/devops/v5_1/work_item_tracking/work_item_tracking_client.py autour de create_work_item et comparez sa signature générée avec la documentation REST liée. Examinez les tests existants des relations entre work items ou les modèles du client afin de déterminer l’approche prise en charge ; le travail est considéré comme terminé lorsque la divergence ou le workflow pris en charge pour établir des liens est documenté et couvert par un test approprié.

I am trying to use the azure-devops python pip package in order to migrate a large amount of Epic/Story/Feature tickets into Azure Devops. I can create singular tickets just fine, but I'm having trouble linking those tickets together by specifying the hierarchy (ticket A is a parent to child tickets B / C / D)

In order to create an EPIC ticket I'm running code like this:

    #set field
    jpo = JsonPatchOperation()
    jpo.from_ = None
    jpo.op = "add"
    jpo.path = "/fields/Microsoft.VSTS.Scheduling.FinishDate"
    jpo.value = default_field
    jpos.append(jpo)
    
    #create work item
    createdWorkItem = wit_client.create_work_item(
        document=jpos,
        project=project.id,
        type="EPIC",
        validate_only=validate_only,
        bypass_rules=bypass_rules,
        suppress_notifications=suppress_notifications
    )

Which works, but now I'm trying to figure out how to give this Epic ticket a linked Child ticket.

In the github repo for this azure-devops python package, I can see that in the definition for create_work_item there is a string variable expand which has an option for Relations

https://github.com/microsoft/azure-devops-python-api/blob/master/azure-devops/azure/devops/v5_1/work_item_tracking/work_item_tracking_client.py#L1578

:param str expand: The expand parameters for work item attributes. Possible options are { None, Relations, Fields, Links, All }.

It's also discussed in the official azure-devops documentation for the create_work_item function:
https://docs.microsoft.com/en-us/rest/api/azure/devops/wit/work-items/create?view=azure-devops-rest-6.0#workitemexpand

But if I add expand='Relations' to my code it results in an error:

    createdWorkItem = wit_client.create_work_item(
        document=jpos,
        project=project.id,
        type="EPIC",
        validate_only=validate_only,
        bypass_rules=bypass_rules,
        suppress_notifications=suppress_notifications,
        expand='Relations'
    )

TypeError: WorkItemTrackingClient.create_work_item() got an unexpected keyword argument 'expand'

Am I using this 'expand' variable correctly? Or is there a different way I should add a child ticket to an epic in azure using python? Thanks