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

{
  "DefaultSearchProviderEnabled": true,
  "DefaultSearchProviderKeyword": "d",
  "DefaultSearchProviderName": "DuckDuckGo",
  "DefaultSearchProviderNewTabURL": "",
  "DefaultSearchProviderSearchURL": "https://start.duckduckgo.com/?q={searchTerms}",
  "DefaultSearchProviderSuggestURL": "https://start.duckduckgo.com/ac/?q={searchTerms}&type=list"
}