We already have a similar feature request in our feedback portal. You can cast your vote for the item, track its progress, subscribe for status changes, and add your comments on the following link: SpreadProcessing: Add axis titles to the charts
Hence, I am changing the status Duplicated pointing to the original feature request.
I hope you find this information helpful. Please, let me know if there is anything else I can assist you with.
Regards,
Dess | Tech Support Engineer, Principal
Progress Telerik