Increase gap between bullet point and text

Question

When using QGraphicsTextItem for editing and rendering text the distance between bullet points and text (in any kind of list) is very small. Is there any way to increase this?

I tried setting a default style sheet on the QTextDocument but can't find a proper CSS property for this specific change.

Here is a sample of how it looks like. The red arrow shows the gap I am talking about:

Thanks, Fabian