how to replace some string from outside in json file

Question

I have a localization map like:

  'en': {
    "timeIsUpTitle": "Time is Up!",

    "workingTimeText": "You are working for{{}} {{}} {{}}.."
  },
  'tr': {
    'timeIsUpTitle': 'Zaman doldu!',

    "workingTimeText": "{}{}{}çalışıyorsun..."
  },

how can I fill these {} sections on the outside? I have some getters for these strings such as,

  String  workingTimeText(String hours, String minutes, String seconds) => localeValues['workingTimeText']!;

  String get timeIsUpTitle => localeValues['timeIsUpTitle']!;

Solution

I solved with format package in pub dev (it's the same as python's format funct.)