1.16.4 - How to show the mob's health above his head?

Question

My objective is to create a health bar above the mob's head, and I was thinking about storing the data in a sign, and then setting the mob's CustomName to the sign Text1, but this way I would need a sign for each mob of my world.

Makonede · Answer

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/scoreboard could help.
scoreboard objectives add health health
# Put the following in a repeating command block
execute as @e[tag=track_health] run data merge @s {CustomName:'{"score":{"name":"@s","objective":"health"}}'}

Old answers
data merge entity @e[tag=track_health,limit=1] {CustomName:'{"nbt":"Health","entity":"@e[tag=track_health,limit=1]"}'

setblock ~ ~ ~ minecraft:sign{Text1:'{"nbt":"Health","entity":"@e[tag=track_health,limit=1]"}'}

1.16.4 - How to show the mob's health above his head?

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