Creating a grouped, stacked bar chart with two levels of x-labels

I am trying to create a grouped, stacked bar chart as seen below. I made this version in Excel but I would like to use plotly to create it. I am struggling to make the groupings and the two-levels of x-labels.

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The documentation shows how to handle a basic version of this, Bar Charts with multicategory axis type

The following code (copied from the link above) will produce the following graph.

import plotly.graph_objects as go
x = [
    ["BB+", "BB+", "BB+", "BB", "BB", "BB"],
    [16, 17, 18, 16, 17, 18,]
fig = go.Figure()

@RicardoR4556 May be this helps Control distance between stacked bars? - #3 by windrose