def METHOD_NAME(self, jsonpath):
    '''Add data as a new unique key under jsonpath. Return {name: new_key}'''
    parent, key, data = self.jsonwalk(jsonpath, create=True)
    if self.request.body:
        if data is None:
            parent[key] = data = {}
        new_key = str(uuid.uuid4())
        data[new_key] = self.parse_body_as_json()
        self.write(json.dumps({'name': new_key}, **self.json_kwargs))
        self.changed = True
    else:
        self.write(json.dumps(None))