Increasing the amount of trees

I am trying to increase the amount of trees generated on Version 1.20.1
I tried changing the count in "data\minecraft\worldgen\placed_feature\trees_taiga.json" but i am not seeing any difference ingame.
      "count": {         "type": "minecraft:weighted_list",         "distribution": [           {             "data": 100,             "weight": 9           },           {             "data": 150,             "weight": 1           }         ]       }
I have increased the count by a lot so there should be at least some visible difference ingame.
What am i missing / doing wrong ?