[BUG] values() and valueMap() inconsistent result displayed in notebook widget

[xianjial]

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Describe the bug
I'm testing backslashes in Gremlin querystring and seeing different results displayed in notebook widget when running queries as below

### TinkerPop Console
gremlin> g.addV('test').property(id, '2').property(single, 'configValue', '[{"p1":1,"p2":"a: \\"b\\""}]').next()
==>v[2]
gremlin> g.V().values()
==>[{"p1":1,"p2":"a: \"b\""}]
gremlin> g.V().valueMap()
==>[configValue:[[{"p1":1,"p2":"a: \"b\""}]]]

### Neptune Notebook (see screenshots to understand it better)
g.V().values()
--> [{"p1":1,"p2":"a: \"b\""}]
g.V().valueMap()
--> {'configValue': ['[{"p1":1,"p2":"a: \\"b\\""}]']}

%graph_notebook_config
{
  ...
  "gremlin": {
    "traversal_source": "g",
    "username": "",
    "password": "",
    "message_serializer": "graphsonv3"
  },
  ...
}
Same result with `GraphBinaryV1` serializer.

Expected behavior
value() and valueMap() should return same result as TinkerPop console.