Hi Natxo,
Greetings from Syncfusion.
We have analyzed the reported scenario. We would like to let you know that currently we don’t use theme for chart, so no need to use material.css file to render chart component. We will change this in our user guide and will be refreshed online for volume 4 main release which is expected to be rolled out in the middle of December 2018.
Thanks,
Dharani.