[Solved]-How to implement mapbubble in highmaps using custom maps json generated using qgis?-Highcharts

The code looks perfectly fine. However, the problem seems to be related to your data.json file. You don't define the size of the bubble (z - property). Check docs: https://api.highcharts.com/highmaps/series.mapbubble.data.z. That's why bubbles are not visible.

Example data.json:

[
  {
    "name" : "GB",
    "deposited" : "5",
    "z": 1000
  },
  {
    "name" : "RU",
    "deposited" : "10",
    "z": 1350
  }
  ...
]