Is there a way to set the label on the y axis of a chart in simple xml?

[travis_bear]

I have the following chart defined in a view:

<chart>
  <searchString>
     index=summary
     report=hw_use_by_jobs 
     orig_host=$host$ |
     chart 
        p50(CPU) as "% CPU use", 
        p50(disk_saturation) as "% disk IO saturation",
        count as DataPoints
        over concurrent_tasks |
     eventstats sum(DataPoints) as Total_DataPoints  |
     fields "concurrent_tasks" "% CPU use" "% disk IO saturation"
  </searchString>
  <title>CPU and Disk Use by Concurrent Task, last 30 days</title>
  <earliestTime>-30d</earliestTime>
  <latestTime>now</latestTime>
  <option name="drilldown">row</option>
  <option name="showPager">true</option>
  <option name="count">15</option>
  <option name="displayRowNumbers">false</option>
  <option name="charting.axisY.maximumNumber">100</option>
</chart>      

How can I set a custom label for the Y axis? I'd prefer to do it the simple XML, but if that's impossible then any working approach would be ok.

[afishkin_splunk · Accepted solution]

Please try Y axis text
By the way following options do not belong to chart, they are ignored for chart, they belong to table
row
true
15
false

[travis_bear]

Thank you that was informative