Minecraft 1.16 mob live with more?

In the MC version 1.16 I created e.g. A zombie with 300 lives [command]

/ summon minecraft: zombie ~ ~ 1 ~ {Health: 300, Attributes: [{Name: "generic.maxHealth", Base: 300}]}

But the zombie then only has as much life as it normally has.

In 1.8 this also works with a similar command.

There's a small mistake in your command

At Health: you have to go 300f and not just 300

EDIT: Sry is wrong xD

Have a look at picasso22's answer

/ summon minecraft: zombie ~ ~ ~ {Health: 300, Attributes: [{Name: "generic.max_health", Base: 300F}]}

Works like that. You are missing the _ from max_health

There's an error in his command, but there's no f.

Ah right xD

Thanks for the help ^^