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Found a work around, but the tooltip do not display anymore: ```R ax_grid(position="front", row = list(colors = "f8f8f8", opacity = 0.1)) ```

Thanks for your help Victor ! I see the trick. It seems to be possible in [echarts4r](https://echarts.apache.org/en/option.html#series-line.label.formatter), I was simply wondering if it followed the same logic here.

Thanks Victor, it works great ! Implementing an easier `formatter` syntax for people who don't know JS would be useful for sure. But also simply providing a link in the...

Hi Victor, Related to this issue: is there a way to vertical-align up the series name in a tooltip generated from multiple custom tooltips? Example: ```R apex( data = n_manufac_year,...