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The line of the note.

<div id="sparkline"></div>
<script>
$("#sparkline").kendoSparkline({
    type: "column",
    valueAxis: {
        notes: {
            data: [{
                value: 15,
                text: "Target",
                line: {
                    width: 3,
                    color: "red"
                }
            }]
        }
    },
    series: [{
        data: [10, 15, 8, 12]
    }]
});
</script>

The line color of the note.

<div id="chart"></div>
<script>
$("#chart").kendoChart({
  series: [{
    data: [1, 2, 3]
  }],
  valueAxis: {
    notes: {
      data: [{
        value: 1,
        line: {
          color: "#aa00bb"
        }
      }]
    }
  }
});
</script>

The line length of the note.

<div id="chart"></div>
<script>
$("#chart").kendoChart({
  series: [{
    data: [1, 2, 3]
  }],
  valueAxis: {
    notes: {
      data: [{
        value: 1,
        line: {
          length: 20
        }
      }]
    }
  }
});
</script>

The line width of the note.

<div id="chart"></div>
<script>
$("#chart").kendoChart({
  series: [{
    data: [1, 2, 3]
  }],
  valueAxis: {
    notes: {
      data: [{
        value: 1,
        line: {
          width: 4
        }
      }]
    }
  }
});
</script>