If ''Threat'' and "portrait"" (or "name") are ticked(enabled or disabled) in settings/target it still don't show percents or any other values. Turning off z-perl and using original target bar -> percents of threat are shown.
I've tried different z-perl versions / re-install client (and checked it on other laptop) - nothing helped.

Up. Maybe there is any workaround or something (except threatmeters)? :'(

I'm also encountering this issue and would very much like it to be fixed. Currently I have to install a separate threat addon, which makes me have yet another UI window in my screen. It would be helpfull if this was just in the target portret within the zperl addon.