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I think you should include your context 2D statement saving and restoring the context (in2 plugins) as following:
ctx.save(); // saves previous config
ctx.font = "bold 16px Arial";
ctx.fillStyle = 'rgb(0, 0, 255,1)';
ctx.fillText( 20, 70, 130 );
ctx.restore(); // restores previous config
Plugin:
var chartjs_draw_in_doughnut_plugin = {
afterDatasetsDraw: function(chart, args, options) {
// Get ctx from string
const ctx = chart.ctx;
// saves the state of the canvas
ctx.save();
// ------------
// FIRST LABEL
// ------------
// creates new path to draw something with the same config
ctx.beginPath();
// sets config
ctx.font = "bold 16px Arial";
ctx.fillStyle = 'rgb(0, 0, 255,1)';
ctx.fillText( 20, 70, 130 );
// fills text
ctx.fill();
// ------------
// SECOND LABEL
// ------------
// creates new path to draw something with the same config
ctx.beginPath();
// sets config
ctx.font = "regular 16px Arial";
ctx.fillStyle = 'rgb(0, 0, 255,0.5)';
ctx.fillText( ' / 50', 85, 130 );
// fills text
ctx.fill();
// restores the state of the canvas
ctx.restore();
}
}
Source:stackexchange.com