Sort by nested Embedded Document List

Question

obj = self.get_object()
# Need to add sorting here
submited_talents_page = paginator.paginate_queryset(
        obj.doc_list, request
    )

the list lloks like this:

obj.doc_list = [{
"user": ObjectId("12123124"),
"viewers": [],
"application": ObjectId("34322")
}
]

application:

"timestamp": "<timestamp>",
"code": "DEF"
}

I need to sort the application.timestamp inside obj.doc_list.