score:0

there should be a chart-options attribute for the canvas. you can add it like: chart-options="chartoptions".

then on your controller you can change the tooltip template by using this code:

$scope.chartoptions = {
     tooltiptemplate: "<%= value %>"
}

but i am not sure if it works properly in chartjs 2.0. for that you can check this issue here : https://github.com/chartjs/chart.js/issues/2322

score:0

you could pass this to the attribute chart-options="options":

$scope.options= {
    tooltips: {
        callbacks: {
            title: function(tooltipitem, data) {
                return $scope.profile['detail']['freq-histogram']['long-labels'][tooltipitem[0].index];
            }
        }
    }
};

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