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Visual map works on series data only, but not axis. If you wish to make a similar result, you may try to set axisLabel.color with a callback where the color is depended on the index.

But the callback doesn't know what the colour should be, considering the axis has a dynamic scale and no access to the gradient interpolation algorithm.

This is not a support issue, this is a new feature. Is it planned?

Perhaps supporting gradient color on the labels can solve this issue.

@pissang If you mean manually applying a gradient then no, that will not help. Since the scale is dynamic (can change), the client will not know how to apply the gradient to the scale itself. The charting library knows the scale and needs to apply it according to the portion of the visualMap that is visible.