View regions with Google Geochart

Question

Is it possible to display the states grouped according to their regions and a tooltip according to the region rather than the state? For example:

• Northern Region -> Acre, Amapá, Amazonas, Pará, Rondônia, Roraima, Tocantins
• South region -> Paraná, Rio Grande do Sul, Santa Catarina
• ...

The northern region when selected would address all listed states and a single description.

I use this code for states, however, I could not remove from the api something related to my doubt.

google.load('visualization', '1', {
        'packages': ['geochart']
    });

    google.charts.setOnLoadCallback(drawRegionsMap);

    function drawRegionsMap() {
        var data = google.visualization.arrayToDataTable([
            ['Region','Views'],
            ['Acre', 0],
            ['Alagoas', 1],
            ['Amapá', 2],
            ['Amazonas', 3],
            ['Bahia', 4],
            ['Ceará', 1],
            ['Distrito Federal', 2],
            ['Espírito Santo', 3],
            ['Goiás', 0],
            ['Maranhão', 5],
            ['Mato Grosso', 0],
            ['Mato Grosso do Sul', 1],
            ['Minas Gerais', 2],
            ['Pará', 3],
            ['Paraíba', 4],
            ['Paraná', 3],
            ['Pernambuco', 2],
            ['Piauí', 4],
            ['Rio de Janeiro', 1],
            ['Rio Grande do Norte', 0],
            ['Rio Grande do Sul', 1],
            ['Rondônia', 5],
            ['Roraima', 2],
            ['Santa Catarina', 4],
            ['São Paulo', 3],
            ['Sergipe', 2],
            ['Tocantins', 0]
        ]);

        var options = {
            region: 'BR',
            resolution: 'provinces',
            colorAxis: {
                values: [0, 1, 2, 3, 4, 5],
                colors: ['red', 'black', 'purple', 'yellow', 'green', 'blue']
            },
            datalessRegionColor: 'transparent',
            legend: 'none'
        };

        var chart = new google.visualization.GeoChart(document.getElementById('chart_div'));

        chart.draw(data, options);
    }