shell-things/etc/opt/chromium/policies/recommended/duckduckgo.json

{
  "DefaultSearchProviderEnabled": true,
  "DefaultSearchProviderImageURL": "https://start.duckduckgo.com/static-assets/favicons/DDG-icon_256x256.png",
  "DefaultSearchProviderKeyword": "d",
  "DefaultSearchProviderName": "DuckDuckGo",
  "DefaultSearchProviderNewTabURL": "https://start.duckduckgo.com/chrome_newtab?addon=newext",
  "DefaultSearchProviderSearchURL": "https://start.duckduckgo.com/?q={searchTerms}&addon=newext",
  "DefaultSearchProviderSuggestURL": "https://start.duckduckgo.com/ac/?q={searchTerms}&type=list",
  "NewTabPageLocation": "https://start.duckduckgo.com/chrome_newtab?addon=newext"
}