Unified hovermode for only one (type of) trace

📊 Plotly Python
1

I took this example code from the documentation and added an extra dimension to the bars and changed them to be stacked:

import plotly.graph_objects as go
from plotly.data import tips

df = tips()

# Summing the values and adding a day order for sorting
summed_values = df.groupby(by="day", as_index=False).sum(numeric_only=True)
day_order_mapping = {"Thur": 0, "Fri": 1, "Sat": 2, "Sun": 3}
summed_values["order"] = summed_values["day"].apply(lambda day: day_order_mapping[day])
summed_values = summed_values.sort_values(by="order")

days_of_week = summed_values["day"].values
total_bills = summed_values["total_bill"].values
number_of_diners = summed_values["size"].values

# Adding some additional data dimension, for example, tips amount
tips_amount = summed_values["tip"].values

# Create a figure object
fig = go.Figure()

# Adding the bar for number of diners
fig.add_trace(
    go.Bar(
        x=days_of_week,
        y=number_of_diners,
        name="Total number of diners",
        marker=dict(color="paleturquoise"),
    )
)

# Adding another bar for tips amount, making the bars stacked
fig.add_trace(
    go.Bar(
        x=days_of_week,
        y=tips_amount,
        name="Total tips",
        marker=dict(color="lightgreen"),
    )
)

# Adding scatter for total bills
fig.add_trace(
    go.Scatter(
        x=days_of_week,
        y=total_bills,
        yaxis="y2",
        mode="lines+markers",
        name="Total bill amount",
        marker=dict(color="crimson"),
    )
)

# Updating layout to incorporate stacked bars and dual y-axes
fig.update_layout(
    barmode='stack',
    legend=dict(orientation="h"),
    yaxis=dict(
        title="Total number of diners and tips",
        side="left",
    ),
    yaxis2=dict(
        title="Total bill amount",
        side="right",
        overlaying="y",
        tickmode="sync",
    ),
)

fig.show()

I would like to modify the hover behavior of the graph so that the hover information for all bars in a stack (number of diners and tips) appears unified when hovering over any part of the stack. However, I want the hover behavior for the line chart to remain as it is, displaying information individually for each point when hovered over.

So far, I only found the ability to set the hovermode on a figure basis, so doing fig.update_layout(hovermode="x unified") would also include the lines.