how to construct a fancy bar chart

Question

I have the following code to produce an almost fancy BarChart:
countries = CountryData["G7"];
data = {{2, 1, 1.5, 3, 3, 2.5, 4}, {-2, -1, -1.5, -3, -3, -2.5, -2}};
BarChart[data, PlotLabel -> "GDP Per Capita", PlotTheme -> "Business",
  ChartLabels -> Placed[countries, Below, Rotate[#, Pi/2.4] &], 
 ChartStyle -> {{Blue, Green}, None}, 
 ChartLegends -> {{"high", "low"}, None}]

My goal is to generate the following format:

I want to have the following modifications to convert my BarChart above. (1) Add a box Downside Scenario to the top of the bar chart in Brown color, and inside the same box add a line of text in small fonts like This is a scenario parameter set, (2) Add a secondary plot label GDP Per Capita in bold, and (3) add a second line of text under GDP per capita such as parameter domain: {1,2,3}

Jagra · Accepted Answer

First thoughts...
countries = CountryData["G7"];
data = {{2, 1, 1.5, 3, 3, 2.5, 4}, {-2, -1, -1.5, -3, -3, -2.5, -2}};

Column[{
  TextCell["GDP Per Capital", "Section", FontColor -> White],
  TextCell["This is a scenario parameter set", FontSize -> 12, 
   FontColor -> White],
  "",
  TextCell["WorldGDP in 2020", FontWeight -> Bold, FontSize -> 20],
  TextCell["parameter domain:{1,2,3}", FontWeight -> Bold, 
   FontSize -> 12],
  "",
  TextCell["% Difference from baseline and contributions in % pts", 
   "TI"],
  BarChart[data,
   PlotTheme -> "Business",
   ChartLabels -> Placed[countries, Below, Rotate[#, Pi/2.4] &],
   ChartStyle -> {{Blue, Green}, None},
   ChartLegends -> {{"high", "low"}, None},
   ImageSize -> 500]
  },
 Alignment -> Center,
 Background -> {Automatic, {1 -> Darker[Red], 2 -> Darker[Red]}}]

Vary your text and colors as desired.

how to construct a fancy bar chart

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