[Python] How to have a line break in math mode in plotly?

Suppose you would like to have a line break in the math mode text in plotly. The following solutions have been tried, but none of them is working in different reasons:

import plotly.graph_objects as go

fig = go.Figure()
fig.add_trace(go.Box(y=[10, 14]))

fig.update_layout(xaxis_title="$\alpha \\ \beta$") # causes to_image error
# fig.update_layout(xaxis_title=r"$\alpha \\ \beta$") # no breaks between math shape of alpha and beta
# fig.update_layout(xaxis_title="$\\alpha$<br>$\\beta$") # only shows math shape of alpha and no beta at all!
# fig.update_layout(xaxis_title="$\\alpha \\\\ \\beta$") # # no breaks between math shape of alpha and beta
# fig.update_layout(xaxis_title="$$\\alpha \\\\ \\beta$$") # no breaks between math shape of alpha and beta
# fig.update_layout(xaxis_title="$$\\alpha$$ <br> $$\\beta$$") # # only shows math shape of alpha and no beta at all!

fig.show()
fig.write_image("this_image.pdf")


So, the question is how to set a line break in a math mode text?

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