I think I can work on this.

Hi, were able to reproduce the error? Is this a bug?

Having the same problem!

For now, as a an alternative, you can override the text class attributes in HTML/CSS in order to style your text. For example, in my styles.css file, I have added the following :

.node-label-text-path {
  fill: rgb(250, 250, 250) !important;
  text-shadow: none
}

Works well for me !

Btw issue is duplicate of #2741

The issue is open, but it is working in plotly 5.3.1

Just curious, is this still an issue or am I just bad at setting the font? Below is my code which sets the font properly if I use show() but not when I convert it to JSON and add it to my Flask dashboard.
fig = go.Figure()

    fig.add_trace(go.Sankey(valuesuffix=value_suffix,
                node=dict(label=labels, color=label_colors),
                link=dict(
                    source=links["source"],
                    target=links["target"],
                    value=links["value"],
                    color=links["link_c"],
                ),
                textfont={'color': 'pink'}))
    # Customize plot based on earlier values
    fig.update_layout(
        title_text=title,
        font_size=font_size,
        font_family=font_family,
        font_color=font_color,
        #width=1000,
        #height=600,
        paper_bgcolor=bg_color,  # (use color name or hex code)
        title={"y": 0.9, "x": 0.5, "xanchor": "center", "yanchor": "top"}  # Centers title
    )

Hi - we are trying to tidy up the stale issues and PRs in Plotly's public repositories so that we can focus on things that are still important to our community. Since this one has been sitting for a while, I'm going to close it; if it is still a concern, please add a comment letting us know what recent version of our software you've checked it with so that I can reopen it and add it to our backlog. Alternatively, if it's a request for tech support, please post in our community forum. Thank you - @gvwilson

Hi. Issue is still present. Cannot change the color of the text of the Sankey node labels.

Streamlit version: 1.42.2

Workaround as mentioned above can be to link a css file and use the below css snipet:

.node-label {
    fill: rgb(0, 0, 0) !important;
    text-shadow: none !important;
}