I use DNS66 downloaded from F-Droid. It registers itself as a VPN, but it’s actually a DNS filter, not a VPN. It works to filter ads on most apps, and you can individually disable it for specific apps if needed.
I also use the Firefox app, which supports a few add-ons (much less than the desktop version), including uBlock and some similar options
I’d recommend one or both. They’re working great for me on a non-rooted Pixel 4a 5G