Can I Somehow See Other People's Health?

After seeing a couple playthroughs of Wynncraft on YT, I wonder how can they see friendly ppl's health? An in-game setting? Or client mod? Any help would be appreciated! :)

 

I think there is a Mod for it, I'm not sure what the rules are with Mods though.

 

Health would show up under your nametag before gavel.

 

Why did they remove it? And what (if there's any) is the name of the mod?

 

Probably because people can have up to like 20000 health.

 

That actually has always been the case, I've once seen a video of someone using damage indicators on wynncraft.
Whenever he looked at players it would show a huge number of hp

This is also why you didn't take any visible damage from lava, yet still received the damage ticks. You took the damage but your health was so high that in order to display it on the health bar, the health bar had to keep being max.
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As for the main question, I guess that you could download a mod to see health bars as well.
Although I'm not 100% sure if it's allowed or not, so checking the rules is advised.