From just_some_user on Curseforge:

There's a mod called "Saturation Overflow" which allows Saturation to go above 20 but only if you aren't already past 20 already, for example... eating something that gives 5 Saturation and you have 19 Saturation will put you at 24 Saturation. There's a config that can remove the soft-cap if one wishes so you can gain Saturation beyond the cap.

By any chance there could be a config option to allow more colored overlays if above 20 saturation? Like the first row is yellow/gold and if between 21 to 40 it'll be orange, 41 to 60 it'll be red, etc.

Or something like in this image...

Color range is yellow to red, 20 to 100 saturation. The numbers on the right of the bars is how much saturation there is currently. If above 100 the overlay remains red unless in the config you add more options. The white outline at the bottom is the base color where the color changes depending on hex color value.

This is for 1.12.2 although it could apply for later versions if there's some mod out there that allows saturation to go above 20.

Just curious of how this is coming along. The color setup that I went with in the image for the default colors was yellow being mild while red being fiery, etc. Like how some hot sauces have a mild, hot, fiery, inferno ratings in terms of how spicy it is. Just to keep it in like with the food theme.

Interesting, but does the overflow saturation indicate multiple or single rows?
Some mods is single row, some mods is multiple rows.