How to plot a polar chart segment (not sector)?

Dear Plotly’s community,

I have been searching for a while on how to make polar chart segments. What I am trying to do is plot starting from a positive radius. As things stand now, I can use mouse to make a polar sector to start from r > 0:
Polar starting from R > 0

However, that is incorrect due to the way angles change if you move R0 to be bigger than 0. A more correct way would be to plot something like this:

Is there any way this could be implemented using Plotly’s tools?

P.S. I have created a similar issue on GitHub a while back.