For NASCAR Cup Series 2023 do a classic NASCAR livery :) like this:

If you can use region, please follow this guide: https://docs.studio-397.com/users-guide/how-to-paint-a-car-with-the-new-material-system

File names for liveries: XX is your car number

Chevrolet
xx_N23_Chevrolet.dds
xx_N23_Chevrolet_Region.dds
xx_N23_Chevrolet.json

Ford
xx_N23_Ford.dds
xx_N23_Ford_Region.dds
xx_N23_Ford.json

Toyota
xx_N23_Toyota.dds
xx_N23_Toyota_Region.dds
xx_N23_Toyota.json