Is there a way to check if 'Unknown Sources' is enabled in Android via my website before I serve the APK from my CDN?

I am building an APK website similar to APKPure.com. The APKs will be served from my CDN. Is there a way to check if the device downloading the APK has 'Unknown Sources' enabled? Are there better methods to do this? I'd like to minimize friction from website visit to install.

Thanks.