[Python] How to rotate a single label in a treemap?

Suppose we have a treemap like this:

import plotly.graph_objects as go
fig = go.Figure(go.Treemap(
parents=['', '', 'A', 'A', 'B'],
labels=['A', 'B', 'a1', 'a2', 'b1']
))
fig.show()


And we need to rotate the b1 label to 90 degrees. Is it possible to do in pyplot?

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