Problem in dash-extendable-graph

Dash Python
1

I want to update the live-graph in such a way that, while new data point comes while only that data point/points will add instead of re-drawing all the previous data mainly because increase performance of the real time system.
From this and this discussion, I found dash-extendable-graph · PyPI .

The example code which updates X and Y works fine. But I wanted that the newly added data points with different marker symbol. But this is not working. I have tried the following code:

import dash_extendable_graph as deg
import dash
from dash.dependencies import Input, Output, State
import dash_html_components as html
import dash_core_components as dcc
import random

app = dash.Dash(__name__)

app.scripts.config.serve_locally = True
app.css.config.serve_locally = True

app.layout = html.Div([
    deg.ExtendableGraph(
        id='extendablegraph_example',
        figure=dict(
            data=[{'x': [0],
                   'y': [0],
                   'mode':'lines+markers',
                    'marker':{'symbol':'circle'}
                   }],
        )
    ),
    dcc.Interval(
        id='interval_extendablegraph_update',
        interval=5,
        n_intervals=0,
        max_intervals=-1),
    html.Div(id='output')
])


@app.callback(Output('extendablegraph_example', 'extendData'),
              [Input('interval_extendablegraph_update', 'n_intervals')],
              [State('extendablegraph_example', 'figure')])
def update_extendData(n_intervals, existing):
    x_new = existing['data'][0]['x'][-1] + 1
    y_new = random.random()
    return [dict(x=[x_new], y=[y_new],marker=dict(symbol=['cross']))], [0], 100


if __name__ == '__main__':
    app.run_server(debug=True)

How can I achieve this?