Dendrogram plot from pre-computed distance matrix (or even pre-computed dendrogram)?

I have a rather computationally expensive distance matrix that I would like to hierarchically cluster. Any chance the option to pass in a distance matrix (or even a hierarchical clustering object of some sort) could be added to figure_factory._dendrogram?

(Iā€™d be happy to try to put together a PR to do this if the plotly team thinks its reasonable, but I may need some support, since I have not worked on this codebase before.)