Try use:

return tooltip + "<br />" + otherTooltip;


The way to do it, is just adding a callback function for the tooltip property that returns an array of strings, each one of the strings will be placed in a new line.

tooltips: {
            callbacks: {
                label: function (tooltipItem, data) {
                    return ['first thing', 'another thing', 'and another one'];


See this jsfiddle...

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