Remove   from the chart

We need help regarding how to remove or replace   in the caption of rows of the chart.
Is there any option to replace or remove   in chart?

 
We have tried with "customizeChartElement" function callback, but how can we update data after removing   from that function.

Note: We have used flexmonster version 2.9.16

Please see below-listed points with Screenshots: 

1. Please see screenshot_1 which is what result we need

https://prnt.sc/26g5su1
2. Please see screenshot_2 there is a column with name "INSTRUMENT CATEGORY" and there was a list of values under this column but the first value is "360" and it is number format. Data in the column "INSTRUMENT CATEGORY" display properly in csv file but in flexmonster it will remove the rest of the string data in the column because we think it will consider data type of first number value like "360".

https://prnt.sc/26g5td8
3. To overcome that issue we have added   after that column value like "360 " and it is fixed as per screenshot_1 and there is display all the data like "360", "Ability" etc under column "INSTRUMENT CATEGORY".

4. Now We have implemented "Chart" please see screenshot_3.
https://prnt.sc/26g5u57

5. But we face an issue in the chart like there is a display " " so we need to remove or replace that  

 
Many thanks
Renier