Remove index column when save data from Charts

Hi Team,

There is an extra column in the exported data from Charts, any idea to remove this column or rename “$k” to some readable words?

It could be easily reproduced from by click the download button → save as… → XLSX


Could you clarify what version of framework do you use? Since 7.2.14 this column is excluded from the export, see: cuba-platform/charts#108.

Thank you!