hvplot histogram: weights, density, cumulative=-1

**Is your feature request related to a problem? Please describe.**

I was using pandas and matplotlib to make histograms, and they support

- density: so I can plot histogram into y range (0, 1), to see things compared w/ the overall counts
- weights: normally histogram is ploted as 'user distributions', let's say each user also has some money; how do we plot their account balance histogram? weights can solve this problem.
- cumulative=-1: sometimes the data is used in reverse order, and we need to reverse the cdf, so we need to use cumulative in different order; as in https://stackoverflow.com/questions/28889845/tricks-to-get-reverse-order-cumulative-histogram-in-matplotlib

When I want to switch to hvplot, they are not supported, I want to know what am I supposed to do?

Should I calculate the result myself, or should hvplot implement these features?

Thanks?