Add tooltip headerFormatter option
I am currently in the middle of a project where I need to format Y values differently per series and the X values need to be converted from timestamps to week numbers.
Right now I'm hacking together a solution based upon feedback in this GitHub issue: https://github.com/highcharts/highcharts/issues/11891
It is not intuitive nor simple. I will work on a PR when time allows.
1
vote
![](https://secure.gravatar.com/avatar/b5ce7e279f93e933eb8c445eab497937?size=40&default=https%3A%2F%2Fassets.uvcdn.com%2Fpkg%2Fadmin%2Ficons%2Fuser_70-6bcf9e08938533adb9bac95c3e487cb2a6d4a32f890ca6fdc82e3072e0ea0368.png)