Yes, quad9 is a DNS provider, meaning the way to configure quad9 as your DNS provider is the same as configuring cloudflare but instead of 1.1.1.1 it's 9.9.9.9 (hence the name quad9)

edit: if you're using android or a browser (or really anything that uses DNS over https), the URLs are different, but you can find more info at https://quad9.net/