Hi! When looking at the available API options for echarts, there's a couple of things that would be cool to have, one of them is to have a `opacity ` setting for the legend option.
The other one is a specific setting that would help stylize bar chart types a little bit more, that one is `barBorderColorOpacity`, since when setting `opacity` for the bar series, it overrides whatever opacity setting you have set for `barBorderColor`. Maybe there's a better option for overriding this, but I'm not sure. If the maintainers agree I could even contribute to adding these two options Please let me know your thoughts Regards Jose Ivan Vargas
