Like in this Picture
Hi @kryptoLuc,
At the moment this isn't possible. We support only custom value lines (horizontal).
It should be easy to support vertical lines too. Feel free to open a feature request in our github repository.
Ok, thank you 
Custom vertical value lines would be awsome.
Are vertical lines or scatter charts supported yet? I don't see scatter chart listed as one of the chart types. Thank you.
Hi @SaturnV,
No, vertical lines and scatter charts are not supported.
Thank you very much for quick reply.