Line chart with column as marker

[michalsitak]

Hey!

I've been reading docs for a while and I couldn't find a proper way to do this:

Have you got any idea? It would be awesome if I could pass custom component as a marker, but as I know it's impossible at the moment.

I was thinking to do line chart + column chart, but I found it hard to add offset only for series with column chart.

Feel free to ask and please forgive me If I didn't meet some rules, It's my first issue on github.