Can't get a lable on the y-achse

Question

I am trying to put labels on the y-Achse on my Dash-Code but it is not working, according to some example code I found online.

My code:

    import dash
import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Input, Output, State
import plotly.graph_objs as go

arrayValues = ['28.687', '29.687', '24.687', '21.687', '25.687', '28.687']

app = dash.Dash()
app.layout = html.Div([
    html.H1('Title'),
    dcc.Dropdown(
        id='my-dropdown',
        options=[
            {'label': 'Fruit', 'value': 'FRUIT'}
           # {'label': 'Tesla', 'value': 'TSLA'},
           # {'label': 'Apple', 'value': 'AAPL'}
        ],
        value='TEMPERATUR'
    ),
    dcc.Slider(
    min=-5,
    max=10,
    step=0.5,
    value=-3,
    ),
    dcc.Graph(id='my-graph', animate=True),
])


@app.callback(Output('my-graph', 'figure'), [Input('my-dropdown', 'value')])
def update_graph(selected_dropdown_value):

    return {
        'data': [
                {'y': arrayValues} #Important part
            ]
    }

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

I have tried adding 'name' = 'somename' or name = 'somename', but it is not working, eventhough it should work.
Example:

 {'y': arrayValues, 'name' = 'somename'} #Important part

I don't get any error or sth, it just doesn't show any results.