Thank you for posting to our forum.
Please check out this demo: https://codepen.io/webdatarocks/pen/rZxaxQ. At line 29, custom title is set for the measure
"Price". At line 42,
"showAggregationLabels" option is set to
false to hide
"Sum of" aggregation labels before the measure name.
Hope it helps.
Thank you very much!