Rose
Here we go. Just follow instructions bellow.
• Open Settings > Network and Internet > Advanced > Private DNS.
• Choose Private DNS provider hostname.
• Input one of Private DNS available on the text column:
- 1dot1dot1dot1.cloudflare-dns.com
- dns.adguard.com
- dns-family.adguard.com
- dns.quad9.net
- dns.google
- dot.tiar.app
- dot-jp.blahdns.com
- dot-de.blahdns.com
- anycast.censurfridns.dk
- unicast.censurfridns.dk
• Done
For other than Android Pie, you can use this apps:
Cloudflare + Free VPN
AdGuard
Intra
Ayra's DNS
You can also use magisk module, search with keyword dns in magisk download.