i18next.com/pages/translate/nesting/locales/en/translation.json

i18next website

{
  "nesting3": "3",
  "girlsAndBoys": "$t(girls, {\"count\": {{girls}} }) and {{count__ boy",
  "girlsAndBoys_plural": "$t(girls, {\"count\": {{girls}} }) and {{count}} boys",
  "girls": "{{count}} girl",
  "girls_plural": "{{count}} girls",
  "key1": "hello world",
  "key2": "say: {{val}}"
}