Bar Chart - How to set the bottom y value of the V bar?

I would like to set a stack bar chart with bars starting from y<0, but I found the bar always start from zero.

In Bokeh, it has an option to set he bottom value for V bars, see link below:

The Bars element is a high-level chart and does not currently allow for setting the lower edge. The only approach to getting the equivalent of a VBar is to use a Rectangles element at least for now. If you have suggestions on how to improve this, filing an issue would be welcome.

Thanks for your response. Rectangles feed my needs.