Underwater Plot doesn't show average of drawdown

[none2003]

When using reports.full, I noticed that the Underwater Plot does not display the average drawdown:

However, in the HTML file generated by reports.html, the average drawdown is displayed:

I understand that when the returns contain multiple columns, it may not be practical to display the average drawdown. That said, it would be highly appreciated if the average drawdown could be shown when the returns are presented as a single series.

[none2003]

I have created a PR for it: https://github.com/ranaroussi/quantstats/pull/490. I would greatly appreciate it if you could kindly review and consider merging it. Thank you so much for your time and support!