[jabberthemutt]

I can highly recommend NetGuard on android, it's non-root and free software.

I wish there was a system that lets me whitelist specific hosts per app.

[kekebo]

You can do that with NetGuard, but it's a pro feature you have to unlock

[jabberthemutt]

Oh oops! I bought it to support the developer and never even noticed that. Thanks!

[propogandist]

Netguards pro features will let you block domains from connecting at the app level.

Also, downloading netguard from github will give you the option to use hostfile to block providers (not available via Play Store).

Separately, if you have root should look into XprivacyLua from the same dev