Enhancement: Allow setting window flags characters

[dlvhdr]

Describe the feature you'd like

A way to set the window flag characters. E.g. 🔍 if a window is zoomed (instead of Z) etc.

Describe alternatives you've considered

I tried setting set-option -g window-status-current-format '#I:#W#{?window_zoomed_flag, 🔍 ,}' but this doesn't work as dracula overrides it.