Add an option for %health-indicator% and %mob-lvl% to maintain space

[Olthoo]

Is your feature request related to a problem? Please describe.
I'm trying to use a resourcepack to make nametag more interesting but the variable number of characters of %health-indicator% and %mob-lvl% make it impossible
Good Case:

Bad Case:

In the bad case you can see that the shorter level make the bar escape to the left and the "sub max health-indicator" bring the rest of the name in the space for the healthbar
Describe the solution you'd like

• Add an option for %health-indicator% and %mob-lvl% to maintain space

Describe alternatives you've considered
Just showing %health-indicator% but player would miss on some informations about the mob

Additional context

It would be even better if %health-indicator% could display a % of the mobs health.

[UltimaOath]

In an effort to clarify the issue, as this originated in Discord;
The idea is that when the bar has reached the final tier of health, instead of the characters disappearing they should be replaced with empty characters so that the spacing of the bar does not change as it does not change when transitioning from tier to tier (one color to the next).

[Olthoo]

Exaclty, and it would be awesome if the level of the mob could be displayed like "lvl 012" as well for the same purpose