Invalid property specified for object of type plotly.graph_objs.scattermap.Textfont: 'shadow'

Hello,

First, thank you for your work.

It seems like the text "shadow" parameter (here in the doc) is missing for go.Scattermap objects.
Without this parameter, we are unable to create visible labels on maps: this is the same problem as report here.

Here is an example of the problem and why border/shadow is required:

Here is a minimum reproducible code

import plotly.graph_objects as go

# Sample data
data = {
    "label": ["New York", "Los Angeles", "Chicago"],
    "latitude": [40.7128, 34.0522, 41.8781],
    "longitude": [-74.0060, -118.2437, -87.6298]
}

# Create a Scattermapbox trace
go.Figure(
    go.Scattermap(
        lat=data["latitude"],
        lon=data["longitude"],
        text=data["label"],
        textfont={
            "color": "white",
            "size": 12,
            #"shadow": "1px 1px 1px black"  # THIS IS THE ISSUE 
        },
        mode="text",
    )
)
# Update layout to include a map style and center
fig.update_layout(
    map=dict(
        style="open-street-map",
        center=dict(lat=37.0902, lon=-95.7129),  # Centered over the USA
        zoom=3
    ),
    margin={"r":0,"t":0,"l":0,"b":0}
)

fig.show()

Result :

This time the labels are white and require black shadow/border to be visible.

Plotly version: 5.24.0
python version: 5.11.11

从 Scattermap 对 textfont 的支持开始，并将其与 text-and-annotations 文档和链接的 plotly.js issue 进行比较。复现带有白色标签的示例，然后确定预期的 shadow 行为，并验证 shadow 属性能够被接受且会使标签可见。