If you are running a modded client or a server that supports mods, these are highly-rated for 1.19.3:
If you tell me more about your setup, I can help you choose the best option: Neat - Minecraft Mods - CurseForge Health bars 1.19.3
: A popular choice on Hangar that creates a holographic display above mobs. It is highly customizable, allowing you to choose between rounded integers, decimals, or even displaying the mob's name alongside their health. If you are running a modded client or
: Offers extensive customization for passive, neutral, and hostile mobs separately. It includes a settings window accessible via a hotkey (default "B") to adjust scaling and positioning. Health bars 1.19.3