Enabled by default
https://www.bleepingcomputer.com/news/security/google-rolls-out-secure-dns-support-to-chrome-for-android/
Google is rolling out DNS-over-HTTPS (DoH) support to Chrome for Android, starting with devices where the web browser has been updated to version 85.
DoH enables DNS resolution over encrypted HTTPS connections instead of using plain text DNS lookups, thus preventing attackers from seeing what sites are you browsing by monitoring your DNS traffic.