How to set custom colour of app icon label in apps listed in app screen

[AnishKrDas]

I am trying to create a theme with the Theme Park application of Good Lock in my Samsung Galaxy S10 Plus running One UI 3.1 with Android 11.
I cannot set the app icon label colour in app screen to the desired colour. Its always defaulted to white.

The below is the home screen where the labels are in a custom colour.

app label colour defaulted to white, expected, custom colour

The below is the apps screen where the labels are in white.

Any leads would be helpful.

[Anamaelo]

Bank of INDIA BRANCH CAMPAL

[Anamaelo]

Pension account number

[Anamaelo]

Maria A.ICE ANA DE MELO