If you are asking is there a way to control the background on a 'per app' basis, the answer is No.
Some apps are hard coded to be light or dark, but very few. Most will follow whatever mode you have set up in settings.
Themes are also hard coded to be light or dark. Make sure whatever theme you choose to use is a light theme. (settings>personalization>themes)
Then play around with those 2 settings I referenced above. (settings>personalization>Colors>(windows mode/app mode)
Many apps, particularly browsers, also have an option in their own settings for light or dark mode. Browsers also follow what browser theme you choose to use.