We have already logged an enhancement ticket WORDSNET-13512 to format chart axis. We have linked your post to the issue id and will notify you as soon as it is implemented.
We have linked your request to related issue id WORDSNET-13934, logged for support of custom color for chart legends.
We have logged a ticket WORDSNET-15706 to support to format data label.
We will appreciate it if you please share some more details of these points, so we will look into these and will log your requirements accordingly.
Furthermore, we will keep you updated about above linked tickets resolution progress within this forum thread.