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You can draw a horizontal line which will separate the texts inside chart, using the following code after drawing the first text …
ctx.beginPath();
ctx.moveTo(centerX - chart.innerRadius, centerY);
ctx.lineTo(centerX + chart.innerRadius, centerY);
ctx.strokeStyle = 'rgba(0, 0, 0, 0.5)';
ctx.stroke();
and that results in …
Here is a working example on Plunker
Source:stackexchange.com