# add <extra></extra> into hovertemplate
# e.g. show both value and percentage in hover info without trace name
fig = go.Figure()
fig.add_trace(
go.Bar(
x=df["steps"],
y=df["reads_percentage"],
name="bar",
customdata=df["reads"],
hovertemplate="%{x}, %{y} <extra></extra>"
# or more custom format
hovertemplate="%{y:.2f}%<br>%{customdata:.0f} reads <extra></extra>",
)
)