Is It Possible To Change Item Rarity Background Colours?

I think I’ve found the file the game uses for the background of items under ui\character\itembackground.tex however I can’t seem to find a way to change the colours that are applied to the background. Is this something that is hardcoded, or does someone know of a way to change the background colours for the different rarity (yellow for magical, green for rare, blue for epic, etc.) backgrounds?

Records/game/gameengine.dbr, Item Info section.

Could you share any additional information? Where would I access this file (I assume a database file?) and what tools would I need to extract/access the file with? Searching for gameengine.dbr in the game directories got no results. Thanks in advance!

Also @DenisMashutikov I know that loose files can be loaded (such as settings for the UI, and fonts), would it be possible to have this edit (purely changing the background colour of the different rarities) done like that as well? Preferably to avoid having an update wiping the changes made.