At a glance, your code looks to be compatible with the GeoCharts - just
change the package from 'geomap' to 'geochart'. Also of note, the
GeoCharts support an option that might be a good end-route for the
color-array generating code you have in there:
colorAxis: {
values: [minValue, 0, maxValue],
colors: ['#FF0000', '#FFFFFF', '#00FF00']
}
This assigns each value in the 'values' array to a color in the 'colors'
array, and the chart applies a gradient between the colors for values in
between.
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