adoin opened a new issue, #18716:
URL: https://github.com/apache/echarts/issues/18716
### What problem does this feature solve?
参考了一众的issue，知道主题切换有一些问题。
在这里提供一个思路也希望能有这方面的实践。
svg模式下可以用css的变量来填充颜色i.o. fill="var(--primry-1-color)"。
canvas模式下只能：getComputedStyle(context.canvas).getPropertyValue("--primry-1-color")，而后进行后续绘制
如此可把主题文件css化，打通layer渲染和canvas/svg渲染。
从而实现如主题切换、局部状态改变之类的需求
### What does the proposed API look like?
如上
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