[Python] How do I set custom axis titles for a go.Figure()?

I have a graph objects Figure and I want to set custom axis titles. I've found how to do it with update_layout() for plotly express figures, but I haven't found a way to do it with a go.Figure(). (Using that instead of a plotly express graph because I'm not sure how to graph an exponential function using plotly express.)

Code:

import numpy as np
import plotly.graph_objects as go
import plotly.io as pio
pio.templates.default = "none"

x = np.linspace(0, 10,100)

graph = go.Scatter(x=x, y=100*pow(1/2, x),
mode='lines',
line_width=2, line_color='red',)

layout = go.Layout(title='My Graph')

fig = go.Figure(data=[graph], layout=layout)

# want to set axis titles!

fig.show()


How can I set custom axis titles?

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