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How to add static labels to plotly express `choropleth_mapbox`?

With current code I get hover tooltips, however those are not visible on PNG export. I need to have static label on each polygon.

plotly choropleth_mapbox

import plotly.express as px

df = px.data.election()
geojson = px.data.election_geojson()

fig = px.choropleth_mapbox(df, geojson=geojson, color="Bergeron",
                           locations="district", featureidkey="properties.district",
                           center={"lat": 45.5517, "lon": -73.7073},
                           mapbox_style="carto-positron", zoom=9)
fig.update_layout(margin={"r":0,"t":0,"l":0,"b":0})
fig.show()

Solutions which I found are not working, they work only for choropleth but not for choropleth_mapbox which I want to use. List of them:

Solution on Stack Overflow:

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