Hiding the player hearts in 1.16+

Hi, so in 1.15.2 there is an easy way to hide the Health bar by editing the code of a new created overlay (Im making a mod which allow the player to have +300 Health, so of course i don't want for half of the screen to be hidden due to the hearts) , sadly, this features don't seem possible since the code in 1.16 and 1.15 isn't the same, its similar, but still different. So if any one have a solution for that, Don't hesitate to tell me!