new Chart(ctx, {
  // ... data ...
  options: {
    // ... other options ...
    plugins: {
      tooltip: {
        mode: 'interpolate',
        intersect: false
      },
      crosshair: {
        line: {
          color: '#F66',  // crosshair line color
          width: 1        // crosshair line width
        },
        sync: {
          enabled: true,            // enable trace line syncing with other charts
          group: 1,                 // chart group
          suppressTooltips: false   // suppress tooltips when showing a synced tracer
        },
        zoom: {
          enabled: true,                                      // enable zooming
          zoomboxBackgroundColor: 'rgba(66,133,244,0.2)',     // background color of zoom box 
          zoomboxBorderColor: '#48F',                         // border color of zoom box
          zoomButtonText: 'Reset Zoom',                       // reset zoom button text
          zoomButtonClass: 'reset-zoom',                      // reset zoom button class
        },
        callbacks: {
          beforeZoom: () => function(start, end) {                  // called before zoom, return false to prevent zoom
            return true;
          },
          afterZoom: () => function(start, end) {                   // called after zoom
          }
        }
      }
    }
  }
});